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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-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-0036
4 points, difficulty 2 of 3Level 5–6not yet calibrated
Ravi cycles 12 km at 24 km per hour, then walks 6 km at 4 km per hour. How many minutes does the whole journey take?
MOD-03Rate, time, distancealso MOD-07
KA-0044
4 points, difficulty 2 of 3Level 5–6not yet calibrated
One tap fills a tank in 6 hours and another fills it in 3 hours. With both running, how long does the tank take to fill?
MOD-04Combined work ratesalso MOD-03, NUM-09
KA-0111
4 points, difficulty 2 of 3Level 5–6not yet calibrated
A mother is 32 and her child is 8. In how many years will the mother be exactly three times as old as the child?
MOD-05Age problemsalso MOD-01, LOG-08
KA-0112
5 points, difficulty 3 of 3Level 5–6not yet calibrated
A class of 12 scored an average of 8. Another class of 18 scored an average of 13. What is the average for all 30 students together?
MOD-08Mixtures and weighted averagesalso NUM-15, 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-0116
4 points, difficulty 2 of 3Level 5–6not yet calibrated
One pipe fills a pool in 12 hours and another fills it in 4 hours. With both running, how many hours does the pool take to fill?
MOD-04Combined work ratesalso MOD-03
KA-0117
4 points, difficulty 2 of 3Level 5–6not yet calibrated
A train covers 150 km at a steady 60 km per hour. How many minutes does the journey take?
MOD-03Rate, time, distancealso MOD-07
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