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Measuring Length: Why the Ruler Doesn't Have to Start at Zero
Many children simply read the number at the end of the ruler. What research on measuring length shows, why the broken ruler task matters and which activities help.
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English
Jigsaw, Inside-Outside Circle, Think-Pair-Share: Cooperative Learning Structures in One Tap
What research knows about cooperative learning structures, when jigsaw, inside-outside circle, numbered heads or think-pair-share fit, and what makes them work.
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Number Reversals: Why German Children Write 31 Instead of 13
Number reversals are common in German because the ones are spoken before the tens. What research shows, what it means for English and what helps.
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When the Clocks Go Back: Telling-the-Time Games for Autumn
The clocks go back on 25 October 2026. How to explain the change to children, clock games about hours and elapsed time, and what research says about sleep.
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Make Ten First: Bridging Ten Strategies for 8 + 5 and a Bridge of Planks
Make ten, near doubles, the power of five, compensation: which bridging ten strategies help and why children need more than one way.
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Derived Facts, Not Counting: Lichterwald Takes Shape
Doubles, near doubles, make ten: how children derive addition facts instead of counting, and how our new German-only app Lichterwald practises it.
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Comparing Quantities Every Day: Six Preschool Maths Games
Six preschool maths games for comparing quantities: muffin tin, fruit bowl, picture book, dot cards, board game and blocks, each backed by research.
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The 50 German Words for Your First Week on the Ward
German nursing vocabulary for your first week: 50 words with their articles, grouped by ward situations, and how to learn them in five days so they stick.
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Data Protection and Learning Plans: What Teachers Should Know
Learning plans and GDPR: why individual learning plans often contain health data under Art. 9 GDPR, who sets the rules and which principles help day to day.
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Flash Cards Without the Rush: Shorter Glances, No Time Pressure
Practising subitizing with quick looks but no time pressure: what research says about viewing time, anxiety and pace, and how we approach it in a new app.
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How to Tell a Good Educational App: A Checklist for Parents
What studies of children's educational apps show about learning, distraction, ads and privacy, plus a twelve-question checklist you can use in ten minutes.
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Tens and Ones: Why Children Need to Bundle Tens Themselves
Understanding place value means more than naming tens and ones. What research says about grouping, ungrouping and base-ten materials.
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Counting-Out Rhymes Around the World: Language, Rhythm and Chance
Why counting-out rhymes sound alike in many languages, how rhymes relate to learning to read, and how random 'eeny, meeny' really is – with a worked example.
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Bridging Ten: The Most Common Hurdle in Year 1 Maths
Why bridging ten trips up so many children, what the counting trap is, and what research says about moving from counting to calculating.
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Learning Plans That Get Read: Short, Specific, Measurable
How to write an individual learning plan that is actually used: what research on IEPs and learning plans shows, and how to make goals short, specific and measurable.
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Times Tables in Year 2: A Plan for the First Weeks
Times tables in Year 2: a six-week plan for parents and teachers, from what “times” means to core facts, derived facts and fluent recall, in ten minutes a day.
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Inverse Relations: Why 3 + 5 and 8 − 5 Belong Together
If you know 3 + 5 = 8, you also know 8 − 5 = 3. What research says about the inverse relation, why fact families are more than a worksheet, and how to practise.
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For Preceptors: Supporting New International Colleagues with Language
Preceptorship for internationally educated nurses: how to check understanding, practise phone calls and documentation, and hand over the language of the ward step by step.
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Round Gold, Octagonal Silver: Designing for Colour-Blind Children
Colour-blind children learn as well as their peers, but colour codes slow them down. Why shape and colour belong together, and how Number Pirates does it.
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The Egg Box as a Ten Frame: A New App Takes Shape
A ten-egg box is a ten frame: two rows of five. What research says about structure and maths manipulatives, and how to practise with one at home.
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Quarter Past, Quarter After, Viertel vier: Regional Ways to Tell the Time
Quarter past three, quarter after three, Viertel vier: how English and German name the quarter hours, where each form is used and what it means for children.
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Grouping Students at the Start of the School Year: Five Methods Compared
Random, teacher-assigned, mixed-ability, friendship groups or counting off: what research says about group composition and when each method fits.
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Starting Year 1: The Maths Basics That Really Matter
Counting to 100 is nice, but it is not what matters most. The maths basics that really count at the start of year 1 (first grade) and how parents can help.
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How Many Things Can Children See at a Glance?
Subitizing: even two-year-olds recognise small amounts without counting. How it develops, what it says about later maths, and how to practise it at home.
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Ene Mene Miste Is Here: Fair Teams in Ten Seconds
Ene Mene Miste turns a list of names into fair, random teams for class, practice or parties. Offline, no account, and skill ratings stay private.
English
Two New Apps, One Learning Path: Comparing Quantities and Telling the Time
Since 7 August, Mengenpiraten and Tinu Time are available. Where both apps sit on the learning path, which ages they are for and what they do not do.
English
Number Pirates Is Here: Comparing Quantities on Six Islands
Number Pirates is on the App Store for iPad: children aged 5 to 8 roll, place coins, compare and capture the difference. What the app does and doesn't do.
English
Tinu Time Is Here: Learn to Tell the Time with Tinu
Tinu Time is on the App Store: telling the time in nine steps, fully narrated, in six languages. What the app does, who it is for and what it doesn’t do.
English
Two Players, One iPad: What a Partner Game Adds to Learning Maths
Partner maths games: what research on peer learning and maths talk shows, and why our comparing game brings two children to one iPad.
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Accessible Practice: Dyslexia Font, Colour Patterns, Calmer Motion
What makes a learning app accessible? What research says about dyslexia fonts, colour blindness in children and motion, and which options Droptiply offers.
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Blue for Hours, Orange for Minutes: Colour-Coded Clock Hands
Colour-coded clock hands for telling the time: what research says about colour as a learning aid, why blue and orange work with colour blindness, and its limits.
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Maths Before School: Should Preschoolers Learn Number Bonds?
What children should know about numbers before starting school, what research says about early maths skills, and why worksheets and sums can wait.
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Picked Last? Why Letting Children Pick Teams Does Harm
When children pick teams, the whole class watches a ranking. What research says about being picked last, and fairer ways to form teams at school.
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Your First Language as a Bridge: Why Explanations in Several Languages
Does your first language help or hold you back when learning German for nursing? What research says, and why PflegeMate explains terms in several languages.
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A Pirate Island for Comparing Quantities: What We Are Working On
A comparing quantities game: roll, place coins, compare, capture the difference. Our game idea and what research says about learning games.
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Half Past Three or Half Four? Why Half Hours Confuse Children
In German, „halb vier“ means 3:30, but in British English „half four“ means 4:30. Why half past trips children up and how to explain it when telling the time.
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The Maths Learning Path: How Our Apps Build on Each Other
Quantities, number bonds, bridging ten, place value, times tables: why primary maths has an order and which steps already exist as an app.
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Common Times Tables Mistakes and What They Reveal
7 × 8 = 48, 3 × 4 = 7, 0 × 5 = 5: times tables mistakes follow patterns. What research says about them and how parents and teachers can read them.
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Does the Alligator Eat the Bigger Number? How Children Learn > and <
Greater than and less than signs: what research says about >, < and =, why the alligator trick is not enough, and which sentences help children.
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Analogue Before Digital: Telling the Time in Nine Steps
Why children should learn to tell the time in steps, why the analogue clock comes first, and the nine-step learning path we are building for Tinu Time.
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Make a Learning Clock: Paper Plate Clock Craft and Telling the Time Games
How to make a paper plate clock with colour-coded hands and a minute ring, plus six games that help children learn to tell the time.
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More, Less or the Same? Why Comparing Amounts Comes Before Calculating
Comparing amounts is a foundation of arithmetic. What research says about more or less, one-to-one correspondence, and how children can practise.
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Spaced Repetition: How Droptiply Finds the Shaky Times Tables Facts
Practising times tables the smart way: why spaced practice and retrieval beat cramming, and how Droptiply brings back the facts a child isn't sure of yet.
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Learning German on Shift Work: Short Sessions That Stick
Learning German while working shifts means little time and often little sleep. What research says about sleep, memory and spaced learning – and how to plan study time wisely.
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When Can Children Tell the Time? What Research Says About Age
O’clock at about 6, to the minute at about 10: what studies say about when children can tell the time, and why teaching matters more than age.
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Maths Without Reading: Why Learning Apps for Year 1 Must Work Without Reading
If a maths app requires reading, it tests reading, not maths. What research says and how apps can work for children who cannot read yet.
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Droptiply Is Here: Times Tables as a Falling-Block Puzzle
Droptiply is on the App Store: every times tables fact is a block sized by its two factors. What the app does, who it’s for and what it doesn’t do.
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Eight Worlds: Making Progress Visible Without Adding Pressure
How do you keep a child motivated to practise times tables without a stopwatch? What research says about motivation, visible progress and timed tests.
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Telling the Time: Why Reading an Analogue Clock Is So Hard for Children
Two hands, two scales, 12 and 60, plus “quarter to”: what children have to juggle when learning to tell the time, and what research says about it.
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How Much Screen Time for Learning Makes Sense?
What the WHO and paediatricians recommend on screen time, how solid the numbers are, and why quality matters as much as minutes for learning apps.
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From Flashcards to Falling Blocks: How Our Game Idea Came About
A times tables game that makes sense: why a block’s size is the multiplication fact in our game, what research says about learning games, and what we do differently.
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Handover in German: Typical Phrases and Pitfalls
For many international nurses, the shift handover is the hardest conversation of the day in German. How handovers are built linguistically, where it goes wrong and how to practise.
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Halfway Through Year One: When a Child Is Still Counting
Is your child still counting to add halfway through their first school year? What's typical at this age, when it's worth a closer look, and what helps now.
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Times Tables as Rectangles: The Multiplication Array as a Thinking Tool
Multiplication arrays show times tables as rectangles: how they make turnaround facts and splitting visible, why children must learn to read them, and how to practise.
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Enactive, Iconic, Symbolic: How Children Come to Understand Maths
Enactive, iconic, symbolic: why children learn maths through doing, pictures and symbols, what manipulatives achieve and what concreteness fading means.
English
Dyscalculia or Maths Difficulties? Terms, Diagnosis and Help
Maths difficulties, maths learning disorder, dyscalculia: what the terms mean, how specialists diagnose dyscalculia and what kind of help works.
English
PflegeMate Is Here: German for Your First Months on the Ward
PflegeMate is on the App Store: a language learning aid with German nursing terms, pictures, translations and three example sentences per word. What it does and doesn't do.
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Core Facts: Deriving the Whole Times Tables from ×1, ×2, ×5 and ×10
Core multiplication facts with 1, 2, 5 and 10 unlock all 100 times tables facts. What research says about derived facts, and how to practise them at home.
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Tangram Animals Instead of Points: Rewards That Don't Distract
Why Zahlzerlegung gives no points, coins or streaks but colours in a tangram animal instead – and what research on rewards in learning apps says about it.
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Points, Stars, Streaks: What Rewards Really Do for Learning
Do rewards kill the joy of learning? What research says about praise, points, badges and daily streaks, and what parents can look for in learning apps.
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Learning Times Tables by Heart? Why Understanding Comes First
Children should eventually know their times tables by heart. Why the route there runs through arrays, anchor facts and derived facts, not rote drilling.
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RR, BZ, i.v.: Learning German Ward Abbreviations the Way They Are Spoken
Abbreviations are everywhere in nursing, and even professionals often misread them. What studies show, and how to learn German abbreviations the way they are spoken.
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Number Bonds at Home: Seven Games Without an App
Beans, a cup, an egg box: seven simple games to practise number bonds at home with everyday things, and what research says about why they work.
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Why Mistakes in Our Apps Shouldn't Be Red
What children really need after a mistake, what research says about feedback and a positive error culture, and why we are moving away from red.
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Number Bonds to 10: Why Memorising Alone Isn’t Enough
Children should eventually know their number bonds to 10 instantly. The surest way there runs through understanding, deriving and spaced practice.
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Der, Die, Das on the Ward: Why Every Word Is Spoken With Its Article
German articles are the most stubborn hurdle, even for very good learners. What research on grammatical gender shows and why we only ever say nouns with their article.
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What Happens After a Mistake: The Whole Shows Its Parts
Mistakes are part of learning maths. What matters is what happens next. What research says about good feedback, and how Zahlzerlegung handles errors.
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Dice, Fingers, Tally Marks, Dots: Why Quantity Pictures Should Change
Your child spots six on a die instantly but counts six fingers one by one? Why different quantity pictures help, and how to switch between them well.
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The Power of Five: Why Children Should See Amounts Instead of Counting Them
We can see up to four things at a glance. Beyond that, structure helps: seven as five and two. What research says about subitizing, ten frames and the power of five.
English
Recall, Not Counting: A Ring That Measures but Doesn't Rush
Number bonds should become automatic, but time pressure can get in the way. Why our app measures recall speed without hurrying a child.
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Counting-Based Calculation: When Does Finger Counting Become a Problem?
Fingers are a good aid when children learn to add. Counting only becomes a risk when it gets stuck. How to tell the difference and what helps.
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Zahlzerlegung Is Now on the App Store
Our first app is out: Zahlzerlegung practises number bonds to 10 with children aged 5 to 7. What it does, what it deliberately leaves out, and who it is for.
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The Number House: How a Classroom Idea Becomes an App
A number house holds every number bond of a number. How to use it, where it falls short, and why its basic part-whole shape guides our first app.
English
Recognising Maths Difficulties: Signs in the First Two Years of School and What Really Helps
How parents and teachers can spot maths difficulties and possible dyscalculia in first and second grade, what is normal, and which support works.
English
Number Bonds: Why 8 = 5 + 3 Is the Key to Arithmetic
A child who knows that 8 is made of 5 and 3 doesn't need to count. Why number bonds and part-whole thinking are the foundation of confident arithmetic.
English
Maths Is Beautiful – So Why Do So Many Children Associate It with Anxiety?
Maths anxiety often starts in first and second grade. How it develops, who it affects, what role adults play and what research shows actually helps.
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One Word, Three Sentences: Patient, Colleague, Doctor
Learning German for nursing means saying the same word three ways: to the patient, to a colleague, to the doctor. What language research says and the idea it led to.
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From Nursing to Maths: Why Lernwunder Builds Maths Apps
We started with the language of internationally educated nurses. Now we are building primary maths apps. What the two have in common, and why.
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Why B2 German Is Not Enough on the Ward: Nursing Language Is a Language of Its Own
B2 certifies good general German. On the ward, nurses also need medical terms, abbreviations, handover talk and documentation – a register of its own.
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International Nurses in Germany: Who Comes, From Where, and What Awaits Them?
One in six nurses in Germany holds a foreign passport. Where they come from, why they come and what the first years in Germany look like.
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Recognition, Language Level, Specialist Language: The Long Road into Nursing in Germany
Nurses trained abroad have to pass three gates to work in Germany. Two of them are tested – the third decides what everyday life on the ward feels like.
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Arriving on the Ward: What Internationally Educated Nurses Face in Their First Weeks in Germany
Almost one in five nurses in Germany holds a foreign passport. What makes the first weeks on the ward so hard – and what research shows actually helps.