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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

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5 pt

Strand

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

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66 problemsClear all filters

KA-0136
5 points, difficulty 3 of 3Level 3–4not yet calibrated
Four children stand in a line. Ana is not first. Bo stands directly behind Ana. Cal is last. Who is first?
LOG-04Ordering and ranking from cluesalso LOG-03, CFT-02
KA-0137
5 points, difficulty 3 of 3Level 3–4not yet calibrated
A jug holds 900 ml of juice. A third is poured out, then 150 ml is added. How many millilitres are in the jug?
MOD-10Multi-step arithmetic word problemsalso NUM-09, MOD-07
KA-0138
5 points, difficulty 3 of 3Level 3–4not yet calibrated
Squares of dots grow: 1 dot, then 4, then 9, then 16. How many dots are in the seventh square?
PAT-04Growth patterns and figurate numbersalso PAT-02, GEO-01
KA-0139
5 points, difficulty 3 of 3Level 3–4not yet calibrated
On a die, opposite faces add to 7. A die rests on a table with 3 on top. What do the four side faces add up to?
GEO-11Dice and cube face relationshipsalso NUM-08, CFT-05
KA-0140
5 points, difficulty 3 of 3Level 3–4not yet calibrated
A code uses the letters A, B and C, each exactly once. How many codes do not start with A?
CNT-03The multiplication principlealso CNT-11, CNT-09
KA-0150
4 points, difficulty 2 of 3Level 3–4not yet calibrated
A diagonal joins two corners of a shape that are not next to each other. How many diagonals does a hexagon have?
CFT-03Try small cases firstalso CNT-08, GEO-06

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