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177 problems, every one written from scratch, every wrong answer carrying the mistake that produces it. 708 explanations in all.

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7–8
9–10
11–12

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NUMNumber & Arithmetic
CNTCounting
GEOGeometry & Visualization
LOGLogic & Deduction
PATPatterns & Sequences
MODModeling & Word Problems
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3 problemsClear all filters

KA-0029
3 points, difficulty 1 of 3Level 5–6not yet calibrated
A rope is 3.5 metres long. A second rope is 240 centimetres long. How much longer is the first rope, in centimetres?
MOD-07Unit conversionalso NUM-09
KA-0113
3 points, difficulty 1 of 3Level 5–6not yet calibrated
A bag of flour holds 2.5 kg. 1750 g are used. How many grams are left?
MOD-07Unit conversionalso NUM-09
KA-0144
3 points, difficulty 1 of 3Level 5–6not yet calibrated
Three more than twice a number is 19. What is the number?
MOD-01Translating a sentence into an equationalso LOG-08