Mental Math
Work through 10 progressively harder questions with carrying, borrowing, multiplication, exact division and brackets. Enter one integer for each answer.
The math collection
Mental math games
Choose direct calculation, open-ended operations or cage deductions. Mental Math checks ten answers; Make 24 combines four tiles; CalcuDoku places 1–4 using arithmetic clues. None uses a countdown.
Choose a challenge01 / Pick your play
Explore all 21 gamesPlay math games
Daily + practice
math5–12 min
CalcuDoku
Four digits. A little arithmetic.
math3–6 min
Make 24
Four numbers. More than one way to think.
math2–4 min
Mental Math
Work it out. Enter the answer.
Illustrations preview each game. Select a card to open the playable version and its instructions.
02 / Find your fit
Calculate an answer or build one
Mental Math supplies an operation. Make 24 supplies a target. CalcuDoku combines cage arithmetic with row and column constraints.
Make 24
Merge four numbers into exactly 24 with addition, subtraction, multiplication and division. Undo is free; revealing an answer skips that puzzle without a point.
CalcuDoku
Fill a 4×4 board with 1–4 once per row and column while satisfying connected arithmetic cages. Daily and Practice have notes, undo and explained hints.
03 / A small plan
Take it at your own pace.A practical math round
Work through ten calculations, including two bracketed questions, then try choosing your own operations in a three-puzzle set.
Mental Math
Complete all 10 whole-number questions to see your correct-answer total and accuracy.
Make 24
Look for useful pairs and build a route to 24 with every tile.
CalcuDoku
Combine cage totals with one-of-each row and column placement.
04 / Before you play
Math game questions
Choose Make 24. It asks you to plan operations, with no timer and unlimited undo. Every starting set has a whole-number solution, while fractional routes are allowed too.
No. Mental Math accepts an integer. Make 24 uses number and operation buttons; CalcuDoku uses a selected square and keypad, with optional keyboard digits.
Follow your curiosity