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Number & Arithmetic15
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Logic & Deduction11
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

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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4 problemsClear all filters

KA-0008
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
The first three patterns are made of dots and follow a rule. How many dots will the fifth pattern have?
PAT-01Continuing a visual patternalso PAT-02
KA-0108
3 points, difficulty 1 of 3Level 3–4not yet calibrated
A pattern of tiles repeats: black, black, white. What colour is the 100th tile?
PAT-03Repeating cycles and position mod nalso NUM-06
KA-0160
3 points, difficulty 1 of 3Level 9–10not yet calibrated
A sequence begins 7, 11, 15, 19, and continues with the same constant step. What is the 30th term?
PAT-02Arithmetic sequences and the nth termalso MOD-01, CFT-10
KA-0171
3 points, difficulty 1 of 3Level 11–12not yet calibrated
A sequence is defined by a(1) = 2 and a(n+1) = 2 a(n) - 1 for every n. What is a(6)?
PAT-05Recursive rulesalso CFT-03, PAT-07

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