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 Work out (−4) × 5.
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4 × 5 = 20 and the signs are different, so the answer is −20.
2 Work out 6 × (−3).
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6 × 3 = 18 and the signs differ, so the answer is −18.
3 Work out (−15) ÷ 3.
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15 ÷ 3 = 5 and the signs are different, so the answer is −5.
Level 2 · Core
4 Work out (−7) × (−8).
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7 × 8 = 56 and the signs match, so the answer is 56.
5 Work out (−48) ÷ (−6).
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48 ÷ 6 = 8 and the signs are the same, so the answer is 8.
6 Work out 42 ÷ (−7).
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42 ÷ 7 = 6 and the signs differ, so the answer is −6.
Level 3 · Challenge
7 Work out (−3) × 4 × (−2).
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3 × 4 × 2 = 24, and there are two negatives, which is even, so the answer is 24.
8 A submarine dives 6 m every minute for 7 minutes. Write its change in depth as an integer.
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7 × (−6) = −42, so it ends 42 m lower than it started.
9 Work out (−9) × (−9) ÷ (−3).
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(−9) × (−9) = 81, then 81 ÷ (−3) = −27. Three negatives is odd, so the answer is negative.