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

Level

1–2
3–4
5–6
7–8
9–10
11–12

Point value

3 pt
4 pt
5 pt

Strand

NUMNumber & Arithmetic
CNTCounting
GEOGeometry & Visualization
LOGLogic & Deduction
PATPatterns & Sequences
MODModeling & Word Problems
CFTContest Craft

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9 problemsClear all filters

KA-0010
3 points, difficulty 1 of 3Level 3–4not yet calibrated
Sam has only 2-cent and 5-cent coins. What is the largest amount under 15 cents that he cannot make exactly?
MOD-06Money and changealso CNT-01
KA-0015
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
The chart shows how many pets four children own. How many more pets does Mia own than Leo?
MOD-09Reading tables, charts, and graphsalso NUM-13
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-0110
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
Ana has three times as many stickers as Bo. Together they have 48. How many does Bo have?
MOD-02Bar models for part–wholealso NUM-11
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-0114
3 points, difficulty 1 of 3Level 3–4not yet calibrated
Three notebooks cost 240 cents each. You pay with a 10 euro note. How many cents change do you get? One euro is 100 cents.
MOD-06Money and changealso NUM-09, MOD-10
KA-0118
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
The chart shows how many books four children read. How many did they read altogether?
MOD-09Reading tables, charts, and graphsalso NUM-13, MOD-10
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
KA-0162
3 points, difficulty 1 of 3Level 9–10not yet calibrated
Two towns are 300 km apart. A car leaves each town at the same moment driving toward the other, one at 60 km/h and the other at 90 km/h. How long until they meet?
MOD-03Rate, time, distancealso CFT-02, CFT-11