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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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55 problemsClear all filters

KA-0153
3 points, difficulty 1 of 3Level 7–8not yet calibrated
A jacket costs 80 pounds. In January the price rises by 20 percent. In February the new price falls by 20 percent. What is the price at the end of February?
NUM-10Percentages and simple discountsalso CFT-11, CFT-10
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-0161
3 points, difficulty 1 of 3Level 9–10not yet calibrated
What is the remainder when 2 to the power 50 is divided by 7?
NUM-06Remainders and modular cyclesalso NUM-07, PAT-03
KA-0162
3 points, difficulty 1 of 3Level 9–10not yet calibrated
Two towns are 300 km apart. A car leaves each town at the same moment driving toward the other, one at 60 km/h and the other at 90 km/h. How long until they meet?
MOD-03Rate, time, distancealso CFT-02, CFT-11
KA-0169
3 points, difficulty 1 of 3Level 11–12not yet calibrated
What is the remainder when 7 to the power 100 is divided by 5?
NUM-06Remainders and modular cyclesalso NUM-07, PAT-03
KA-0170
3 points, difficulty 1 of 3Level 11–12not yet calibrated
What is the size of one interior angle of a regular twelve-sided polygon?
GEO-05Angles on lines, in triangles, in polygonsalso CFT-10, CFT-11
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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