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Number & Arithmetic15
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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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1–2
3–4
5–6
7–8
9–10
11–12

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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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KA-0035
3 points, difficulty 1 of 3Level 5–6not yet calibrated
Eight people meet and everyone shakes hands with everyone else exactly once. How many handshakes take place?
CNT-08Handshakes and pairsalso CNT-06
KA-0143
3 points, difficulty 1 of 3Level 5–6not yet calibrated
How many three-digit numbers can be written using only the digits 1 and 2, with repeats allowed?
CNT-01Systematic listingalso CNT-03, NUM-01

Browse the problems — Kangaroo Atlas