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The whole Atlas

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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27 problemsClear all filters

KA-0001
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
A 3 by 3 board is drawn. How many 2 by 2 squares can be found on it, if they must line up with the grid?
CNT-12Counting by position (sliding window)also CNT-01
KA-0002
3 points, difficulty 1 of 3Level 3–4not yet calibrated
Ana adds up the first seven odd numbers: 1 + 3 + 5 + 7 + 9 + 11 + 13. Is her total odd or even, and what is it?
NUM-03Parity of numbers (odd/even behavior)
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-0006
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
On the number line shown, the marks are equally spaced. What number does the arrow point to?
NUM-13Number lines and betweennessalso MOD-09
KA-0008
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
The first three patterns are made of dots and follow a rule. How many dots will the fifth pattern have?
PAT-01Continuing a visual patternalso PAT-02
KA-0010
3 points, difficulty 1 of 3Level 3–4not yet calibrated
Sam has only 2-cent and 5-cent coins. What is the largest amount under 15 cents that he cannot make exactly?
MOD-06Money and changealso CNT-01
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-0015
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
The chart shows how many pets four children own. How many more pets does Mia own than Leo?
MOD-09Reading tables, charts, and graphsalso NUM-13
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-0050
3 points, difficulty 1 of 3Level 3–4not yet calibrated
Toma spent 4 euros, then spent half of what was left, and now has 6 euros. How much did she start with?
LOG-08Working backwardsalso MOD-06
KA-0051
3 points, difficulty 1 of 3Level 3–4not yet calibrated
How many of the numbers from 1 to 20 are not multiples of 3?
CNT-09Complementary countingalso CNT-01
KA-0054
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
A rectangle is divided by two vertical lines into three parts. How many rectangles of any size are in the picture?
CNT-13Counting shapes hidden inside a figurealso CNT-01

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