Work through the levels in order. Type your answer and press Check — open the worked solution if you get stuck. Answers like -6, 3/4 or 0.25 are typed exactly as shown. A ⭐ Bonus Challenge at the end is extra credit — skip it if the rest was hard work.
Level 1 · Warm-up
1 ▢ + 7 = 15. What number belongs in the box?
Show worked solution
15 − 7 = 8. (8 + 7 = 15.)
2 12 − ▢ = 5. What number belongs in the box?
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12 − 5 = 7. (12 − 7 = 5.)
3 ▢ × 3 = 18. What number belongs in the box?
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18 ÷ 3 = 6. (6 × 3 = 18.)
Level 2 · Core
4 ▢ + 6 = 20 − 5. What number belongs in the box?
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The right side is 20 − 5 = 15, so ▢ + 6 = 15 and ▢ = 9.
5 4 × ▢ = 6 × 6. What number belongs in the box?
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6 × 6 = 36, so 4 × ▢ = 36 and ▢ = 36 ÷ 4 = 9.
6 ▢ − 8 = 27. What number belongs in the box?
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Put the 8 back: 27 + 8 = 35. (35 − 8 = 27.)
Level 3 · Challenge
7 ▢ + ▢ + ▢ = 24, where every box holds the SAME number. What is it?
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24 ÷ 3 = 8. (8 + 8 + 8 = 24.)
8 ▢ × 5 = 100 − 40. What number belongs in the box?
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100 − 40 = 60, so ▢ × 5 = 60 and ▢ = 60 ÷ 5 = 12.
9 24 ÷ ▢ = 12 ÷ 2. What number belongs in the box?
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12 ÷ 2 = 6, so 24 ÷ ▢ = 6 and ▢ = 24 ÷ 6 = 4.
⭐ Bonus Challenge · only if the rest felt easy
10 ▢ × 4 = 60 − 8. What number goes in the box?
Show worked solution
The right side is 60 − 8 = 52. So ▢ × 4 = 52, which means ▢ = 52 ÷ 4 = 13.