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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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5 problemsClear all filters

KA-0030
4 points, difficulty 2 of 3Level 5–6not yet calibrated
A sequence starts 4, 7, 10, 13 and continues in the same way. What is the 20th term?
PAT-02Arithmetic sequences and the nth termalso PAT-04
KA-0103
4 points, difficulty 2 of 3Level 5–6not yet calibrated
A sequence starts at 3. Each term after that is double the one before it, minus 1. What is the sixth term?
PAT-05Recursive rulesalso PAT-02
KA-0104
4 points, difficulty 2 of 3Level 5–6not yet calibrated
A sequence starts 1, 1, and every term after that is the sum of the two before it. What is the eighth term?
PAT-05Recursive rulesalso PAT-04
KA-0106
5 points, difficulty 3 of 3Level 5–6not yet calibrated
A machine turns 3 into 7, 5 into 11 and 8 into 17. What does it turn 12 into?
PAT-07Inferring a rule from examplesalso PAT-05, CFT-03
KA-0107
4 points, difficulty 2 of 3Level 5–6not yet calibrated
Dots are arranged in triangles: 1 dot, then 3, then 6, then 10, and so on. How many dots does the tenth triangle have?
PAT-04Growth patterns and figurate numbersalso NUM-08, CNT-08