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Number & Arithmetic15
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Patterns & Sequences7
Modeling & Word Problems10
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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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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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15 problemsClear all filters

KA-0148
4 points, difficulty 2 of 3Level 5–6not yet calibrated
What is the smaller angle between the hands of a clock at exactly 4 o'clock?
GEO-18Clock geometry: hands, angles, timesalso GEO-05, NUM-11
KA-0155
4 points, difficulty 2 of 3Level 7–8not yet calibrated
A photograph measures 8 cm by 12 cm. It is enlarged so that the shorter side becomes 20 cm, and the shape is not distorted. How long is the longer side of the enlargement?
GEO-16Scaling and similar figuresalso NUM-11, CFT-11
KA-0164
4 points, difficulty 2 of 3Level 9–10not yet calibrated
Two triangles are similar. The sides of the smaller are 3/5 as long as the matching sides of the larger. The smaller triangle has area 18 square cm. What is the area of the larger triangle?
GEO-16Scaling and similar figuresalso NUM-11, CFT-11

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