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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-0005
4 points, difficulty 2 of 3Level 3–4has a figurenot yet calibrated
A net of six squares folds into a cube. One square is shaded. Which square ends up opposite the shaded one?
GEO-10Nets and folding, 2D to 3Dalso GEO-11
KA-0016
4 points, difficulty 2 of 3Level 3–4not yet calibrated
On a standard die opposite faces add to 7. Two dice are stacked. The touching faces show 3 on the upper die and 5 on the lower. What number is on the bottom face?
GEO-11Dice and cube face relationshipsalso GEO-10
KA-0081
4 points, difficulty 2 of 3Level 3–4has a figurenot yet calibrated
A solid is built from unit cubes. The two pictures show it from above and from the front. What is the smallest number of cubes it could be made of?
GEO-12Views of a solid: top, front, sidealso GEO-13, CNT-14
KA-0085
4 points, difficulty 2 of 3Level 3–4not yet calibrated
How many lines of symmetry does a regular hexagon have?
GEO-08Line and rotational symmetryalso GEO-09
KA-0089
4 points, difficulty 2 of 3Level 3–4not yet calibrated
A cube 3 units on each side is built from unit cubes and painted all over the outside. How many of the small cubes have no paint on them at all?
GEO-13Building and counting with unit cubesalso CNT-14