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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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3 problemsClear all filters

KA-0131
4 points, difficulty 2 of 3Level 3–4not yet calibrated
Twice a number, with 3 added, gives 17. Which of the choices is the number?
CFT-04Back-solve from the answer choicesalso MOD-01, LOG-08
KA-0132
4 points, difficulty 2 of 3Level 3–4not yet calibrated
Ana has exactly 5 coins, each worth either 2 cents or 5 cents. Which of these could NOT be her total?
CFT-05Eliminate impossible choices by boundingalso CNT-04, NUM-06
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