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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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66 problemsClear all filters

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-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-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
KA-0127
3 points, difficulty 1 of 3Level 3–4not yet calibrated
One minute is left. Three questions have no answer written and you cannot do any of them. Nothing is taken off for a wrong answer. What should you do?
CFT-09Never leave a blank — there is no penaltyalso CFT-08
KA-0131
4 points, difficulty 2 of 3Level 3–4not yet calibrated
Twice a number, with 3 added, gives 17. Which of the choices is the number?
CFT-04Back-solve from the answer choicesalso MOD-01, LOG-08
KA-0132
4 points, difficulty 2 of 3Level 3–4not yet calibrated
Ana has exactly 5 coins, each worth either 2 cents or 5 cents. Which of these could NOT be her total?
CFT-05Eliminate impossible choices by boundingalso CNT-04, NUM-06
KA-0133
5 points, difficulty 3 of 3Level 3–4not yet calibrated
How many squares of any size can be found on a 3 by 3 board?
CNT-13Counting shapes hidden inside a figurealso CNT-12, CNT-04
KA-0134
5 points, difficulty 3 of 3Level 3–4not yet calibrated
A square sheet is folded in half, then in half again. Two holes are punched through all the layers. How many holes are there when it is unfolded?
GEO-15Paper folding and hole punchingalso GEO-09, CNT-03
KA-0135
5 points, difficulty 3 of 3Level 3–4not yet calibrated
How many two-digit numbers have both of their digits odd?
NUM-02Digit-constraint puzzlesalso NUM-03, CNT-03

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