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Number Sense
13 apps to play — grouped by age.
🐣 Ages 3–5 · Pre-K & K
BuilderTots
Ages 3–5 · Gr K–K Level 1
A first building game for ages 3–5: Timber the beaver builds cozy things from parts! Each thing has a little recipe — a birdhouse needs 2 logs and 1 leaf. Tap the piles to gather the right number of each part, then tap Build. No reading needed (tap to hear it), no score, no losing — just a workshop full of things you made.
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RollTots
Ages 3–5 · Gr K–K Level 1
The very first counting game, for ages 3–5: Puff the frog is waking up the pond! Roll the big die, count the dots, then tap the lily-pad with that many fish — it wakes up with a splash. No reading needed (tap to hear it), no score, no losing — just a happy, wide-awake pond.
Play RollTots →
🎈 Ages 6–8 · Grades 1–3
SumPals
Ages 6–8 · Gr 1–3 Level 1
Count on to add all the way to fluent facts with Sumi the squirrel — ten-frames, number bonds, place value, and fact fluency for grade 1–2.
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SevenPals
Ages 6–8 · Gr 1–3 Level 2
A first probability game for ages 6–8: place your ladybirds on the flower patches (2–12) you think will bloom most, roll two dice, count the dots — and find out why 7 comes up most of all. Play 5 rounds with Lucky the ladybird, or pass the tablet. On-device, no accounts, no clock — a wrong guess is part of the fun.
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StandPals
Ages 7–8 · Gr 2–3 Level 2
Run a lemonade stand and use the friendly till — take an order, make change, add up the day, take away the supplies, and see your profit on a bar chart. Real money math with 4 little stand-keeper friends. No ads, no account, no AI, and no money ever touches the app.
Play StandPals →
🎒 Ages 9–14 · Grades 4–8
NumberSense
Ages 8–10 · Gr 3–5 Level 1
Guess first, then compute — a daily estimation workout that builds a real feel for numbers.
Play NumberSense →
MathVerse
Ages 9–10 · Gr 4–5 Level 1
Build numbers from base-ten blocks, place and round on the number line, solve by jumping, subitize on a rekenrek, and practice place value, operations, factors, primes & integers across 12 kits.
Play MathVerse →
CardForge
Ages 9–12 · Gr 4–7 Level 2
Build runs and sets at the card table, predict how a card trick is forced, and practice 16 kits from the deck to combinatorics.
Play CardForge →
TileTales
Ages 10–12 · Gr 5–7 Level 2
Dominoes as number sense — read the pips at a glance, add the open ends to a multiple of five to score, and be first to shed your tiles. Play a graded bot, a friend on this device, or a friend online.
Play TileTales →
TradeForge
Ages 9–13 · Gr 4–8 Level 3
A day on the job with twelve trades, for ages 9–14. The electrician sizing a circuit, the plumber’s slope, the baker’s ratio, the nurse’s dose — each worker is one piece of real math. You see a real job, GUESS the answer, then watch the worker compute it and explain. Applied arithmetic + a look at real careers. On-device, no accounts.
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CalendarForge
Ages 10–13 · Gr 5–8 Level 3
Why does Tết move? Why does Ramadan slide earlier every year? Because the sun and the moon keep two clocks that don’t divide evenly — and you can do the arithmetic. Build a solar, lunar, and lunisolar calendar, predict how far each one drifts against the seasons, then watch the days pile up on a drift chart. Real, tiny, deterministic maths — no internet. Ages 9–14.
Play CalendarForge →
🎓 Ages 15–18 · Grades 9–12
VectorForge
Ages 15–18 · Gr 9–12 Level 5
Linear algebra you can see, for ages 15–18. A 2×2 matrix is a transform of the plane — rotate, stretch, shear, reflect, flatten. Predict where a point lands, then watch the matrix move a shape: the determinant is how much it scales area, and the eigenvectors are the directions that don’t turn. It’s the on-ramp to the maths behind AI — a matrix is a neural layer. On-device, exact arithmetic.
Play VectorForge →
PrimeDojo
Ages 15–18 · Gr 9–12 Level 4
Multiply two primes: easy. Un-multiply their product: nearly impossible. That one gap is why your bank is safe. PrimeDojo walks you from clock arithmetic to a working RSA key you build, encrypt with, decrypt with — and then BREAK by factoring, all by hand and all on your device. Predict each step, then watch the maths. Ages 15–18.
Play PrimeDojo →