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Number & Arithmetic15
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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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6 problemsClear all filters

KA-0004
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
Four road signs are shown. Exactly one of them has two lines of symmetry. Which one is it?
GEO-08Line and rotational symmetry
KA-0013
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
The L-shaped figure is made of unit squares. What is its perimeter?
GEO-01Perimeter and area of rectilinear shapes
KA-0048
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
Which of these arrangements of six squares cannot be folded into a closed cube?
GEO-10Nets and folding, 2D to 3Dalso GEO-08
KA-0079
3 points, difficulty 1 of 3Level 3–4not yet calibrated
Which of these is true of every rectangle?
GEO-06Properties of triangles and quadrilateralsalso GEO-08
KA-0083
3 points, difficulty 1 of 3Level 3–4not yet calibrated
A rectangle has a perimeter of 20 cm. One of its sides is 6 cm. What is its area in square centimetres?
GEO-01Perimeter and area of rectilinear shapes
KA-0086
3 points, difficulty 1 of 3Level 3–4not yet calibrated
A floor measuring 6 by 4 units is covered exactly with tiles measuring 2 by 1, with no gaps and no overlaps. How many tiles are needed?
GEO-14Tiling and tessellationalso GEO-01

Browse the problems — Kangaroo Atlas