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177 problems, every one written from scratch, every wrong answer carrying the mistake that produces it. 708 explanations in all.

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7–8
9–10
11–12

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NUMNumber & Arithmetic
CNTCounting
GEOGeometry & Visualization
LOGLogic & Deduction
PATPatterns & Sequences
MODModeling & Word Problems
CFTContest Craft

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3 problemsClear all filters

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