DEPS Add & Subtract

DEPS Add & Subtract turns addition and subtraction into a colorful adventure. Children don't just memorize answers — they learn the strategies that real mental math is built on, one playful world at a time.

8 WORLDS, 8 STRATEGIES • Ten Bridge – make a ten first, then add the rest (8 + 6 = 8 + 2 + 4) • Hundreds Castle – jump rows of ten and squares of one on the hundreds chart • Break & Build – add tens to tens and ones to ones with base-ten blocks • Kangaroo Jumps – hop along an empty number line • Missing Piece – solve subtraction by adding on, with story problems and bar models • Magic Adjust – use a friendly number and fix it, or keep the same difference • Trading Market – the written column method with trades, shown the way it is taught in your country • Estimation Arena – over or under, rounding, front-end estimates and Box Math

LEARNS FROM MISTAKES Boss levels include an "Error Hunter": spot a friend's typical mistake (like 56 + 97 = 1413) and fix it. When your child makes one of these common mistakes, DEPS notices it and re-teaches the idea step by step with the strategy your child picked.

MADE FOR EVERY CLASSROOM • Grades 1–6: difficulty adapts to your child's grade and speed • 8 languages: English, Turkish, Spanish, German, French, Portuguese, Arabic and Russian • Local math notation: decimal commas, Arabic-Indic digits, and the written subtraction method used in your country (borrowing or equal additions)

FUN THAT BRINGS THEM BACK Stars, chests, a daily streak, a closet full of outfits for Deps, and a 60-second Speed Round with a weekly class leaderboard (nicknames only).

FOR PARENTS AND TEACHERS • Detailed progress report by email: what your child can do, what needs practice and which misconceptions appeared • Follow code to see progress from another device • Daily play limit and parent PIN • No ads, no tracking, no account

Activities are based on Chapter 11 of John A. Van de Walle's "Elementary and Middle School Mathematics: Teaching Developmentally".

The first two levels of the first two worlds are free. A one-time purchase unlocks every level.

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