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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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19 problemsClear all filters

KA-0124
3 points, difficulty 1 of 3Level 5–6not yet calibrated
Which of these is closest to the number of seconds in one day?
CFT-06Estimate to the nearest choicealso MOD-07, NUM-12
KA-0141
3 points, difficulty 1 of 3Level 5–6not yet calibrated
Which of these fractions lies between one third and one half?
NUM-13Number lines and betweennessalso NUM-09
KA-0142
3 points, difficulty 1 of 3Level 5–6not yet calibrated
Which capital letter, printed plainly, has both a horizontal and a vertical line of symmetry?
GEO-08Line and rotational symmetryalso GEO-09
KA-0143
3 points, difficulty 1 of 3Level 5–6not yet calibrated
How many three-digit numbers can be written using only the digits 1 and 2, with repeats allowed?
CNT-01Systematic listingalso CNT-03, NUM-01
KA-0144
3 points, difficulty 1 of 3Level 5–6not yet calibrated
Three more than twice a number is 19. What is the number?
MOD-01Translating a sentence into an equationalso LOG-08
KA-0145
3 points, difficulty 1 of 3Level 5–6not yet calibrated
A counter sits at the point (3, 5) on a grid. It moves 4 squares right and 2 squares down. Where is it now?
GEO-02Grid coordinates and lattice reasoningalso GEO-09
KA-0146
3 points, difficulty 1 of 3Level 5–6not yet calibrated
Suppose it is true that some birds cannot fly. Which of these must also be true?
LOG-01Reading a logical statement preciselyalso LOG-09

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