DEPS Add & Subtract

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DEPS Add & Subtract turns addition and subtraction into a colorful adventure

Miksi odotamme sitä: Strategy-based math learning, mistake-driven re-teaching, and detailed parent reports make this a promising app for young learners.

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DEPS Add & Subtract is a math game for children in grades 1 to 6 that teaches mental math strategies such as making a ten and using a number line, across eight themed worlds. It offers eight languages, progress reports for parents and teachers, and no ads, tracking, or account required. Its boss levels include an Error Hunter that spots common mistakes and re-teaches the idea step by step.

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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.