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.
Level 1 · Warm-up
1 Evaluate: 3.6 + 2.75
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Line up the points: 3.60 + 2.75 = 6.35.
2 Evaluate: 8.1 − 2.36
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Write 8.10 − 2.36, borrow across the columns: 5.74.
3 Evaluate: 0.7 × 0.3
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7 × 3 = 21, with 1 + 1 = 2 decimal places: 0.21.
Level 2 · Core
4 Evaluate: 4.8 ÷ 0.6
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Multiply both by 10: 48 ÷ 6 = 8.
5 Evaluate: 2.45 × 1.2
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245 × 12 = 2940, with 2 + 1 = 3 decimal places: 2.940 = 2.94.
6 Round 17.386 to 1 decimal place.
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Keep 17.3, look at the next digit (8 ≥ 5) → round up: 17.4.
Level 3 · Challenge
7 Evaluate: 0.084 ÷ 0.007
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Multiply both by 1000: 84 ÷ 7 = 12.
8 Round 0.020 496 to 2 significant figures.
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First two s.f. are 2 and 0 (the 0 after the 2 counts — it is between/after non-zero start). Next digit is 4 → no round-up: 0.020. The trailing zero must be written.
9 Evaluate: 3.5 × 0.4 − 1.26 ÷ 0.9
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× and ÷ first: 3.5 × 0.4 = 1.4, and 1.26 ÷ 0.9 = 12.6 ÷ 9 = 1.4. Then 1.4 − 1.4 = 0.