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The whole Atlas

Number & Arithmetic15
Counting18
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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Newest

177 problems

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-0014
4 points, difficulty 2 of 3Level 3–4not yet calibrated
Beads are threaded in the repeating order red, green, blue, yellow. What colour is the 30th bead?
PAT-03Repeating cycles and position mod nalso NUM-06
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-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-0017
5 points, difficulty 3 of 3Level 3–4not yet calibrated
Ana says "Bo is lying." Bo says "Cal is lying." Cal says "Ana and Bo are both lying." How many of the three are telling the truth?
LOG-02Truth-tellers and liarsalso LOG-01, LOG-09
KA-0018
5 points, difficulty 3 of 3Level 3–4not yet calibrated
A three-digit code uses only the digits 1, 2 and 3, and digits may repeat. How many such codes contain at least one 3?
CNT-09Complementary countingalso CNT-03, CNT-04
KA-0019
4 points, difficulty 2 of 3Level 3–4not yet calibrated
A pack of 24 pencils is shared equally among 4 children. Each child then gives 2 pencils to a teacher. How many pencils do the children have left altogether?
MOD-10Multi-step arithmetic word problemsalso NUM-09, MOD-06
KA-0020
5 points, difficulty 3 of 3Level 3–4has a figurenot yet calibrated
A square sheet is folded in half top to bottom, then in half left to right. One hole is punched through all the layers. How many holes are in the unfolded sheet?
GEO-15Paper folding and hole punchingalso GEO-08, GEO-09
KA-0021
3 points, difficulty 1 of 3Level 5–6not yet calibrated
Today is Tuesday. What day of the week will it be in 100 days?
NUM-06Remainders and modular cyclesalso PAT-03
KA-0022
3 points, difficulty 1 of 3Level 5–6not yet calibrated
In a triangle, one angle is 90 degrees and another is 35 degrees. What is the third angle?
GEO-05Angles on lines, in triangles, in polygons
KA-0023
4 points, difficulty 2 of 3Level 5–6not yet calibrated
A password is one letter from A, B, C followed by two digits from 1 to 5. Digits may repeat. How many passwords are possible?
CNT-03The multiplication principlealso CNT-05
KA-0024
4 points, difficulty 2 of 3Level 5–6not yet calibrated
Red and blue counters are in the ratio 3 to 5. There are 40 counters altogether. How many are red?
NUM-11Ratio as parts of a wholealso NUM-09

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