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The whole Atlas

Number & Arithmetic15
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Geometry & Visualization18
Logic & Deduction11
Patterns & Sequences7
Modeling & Word Problems10
Contest Craft12

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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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177 problems

KA-0109
4 points, difficulty 2 of 3Level 3–4not yet calibrated
A staircase of blocks has 4 blocks in the first step, 7 in the second and 10 in the third. How many blocks are in the eighth step?
PAT-02Arithmetic sequences and the nth termalso PAT-01
KA-0110
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
Ana has three times as many stickers as Bo. Together they have 48. How many does Bo have?
MOD-02Bar models for part–wholealso NUM-11
KA-0111
4 points, difficulty 2 of 3Level 5–6not yet calibrated
A mother is 32 and her child is 8. In how many years will the mother be exactly three times as old as the child?
MOD-05Age problemsalso MOD-01, LOG-08
KA-0112
5 points, difficulty 3 of 3Level 5–6not yet calibrated
A class of 12 scored an average of 8. Another class of 18 scored an average of 13. What is the average for all 30 students together?
MOD-08Mixtures and weighted averagesalso NUM-15, NUM-11
KA-0113
3 points, difficulty 1 of 3Level 5–6not yet calibrated
A bag of flour holds 2.5 kg. 1750 g are used. How many grams are left?
MOD-07Unit conversionalso NUM-09
KA-0114
3 points, difficulty 1 of 3Level 3–4not yet calibrated
Three notebooks cost 240 cents each. You pay with a 10 euro note. How many cents change do you get? One euro is 100 cents.
MOD-06Money and changealso NUM-09, MOD-10
KA-0115
4 points, difficulty 2 of 3Level 3–4not yet calibrated
There are 5 boxes with 12 pencils in each. 17 pencils are given away and the rest are shared equally between 2 children. How many does each child get?
MOD-10Multi-step arithmetic word problemsalso MOD-02, NUM-09
KA-0116
4 points, difficulty 2 of 3Level 5–6not yet calibrated
One pipe fills a pool in 12 hours and another fills it in 4 hours. With both running, how many hours does the pool take to fill?
MOD-04Combined work ratesalso MOD-03
KA-0117
4 points, difficulty 2 of 3Level 5–6not yet calibrated
A train covers 150 km at a steady 60 km per hour. How many minutes does the journey take?
MOD-03Rate, time, distancealso MOD-07
KA-0118
3 points, difficulty 1 of 3Level 3–4has a figurenot yet calibrated
The chart shows how many books four children read. How many did they read altogether?
MOD-09Reading tables, charts, and graphsalso NUM-13, MOD-10
KA-0119
3 points, difficulty 1 of 3Level 3–4not yet calibrated
Bo has 24 marbles and gives a third of them to Ana. How many more marbles does Bo have than Ana now?
CFT-01Find what is actually being askedalso NUM-09
KA-0120
3 points, difficulty 1 of 3Level 3–4not yet calibrated
A cat walks 3 m north, then 4 m east, then 3 m south. How many metres is it now from where it started?
CFT-02Draw the diagramalso GEO-02

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