The answer to a subtraction is the gap between two numbers. If you add the same amount to both numbers, the gap does not change. So push the number you take away up to a round ten, push the other number up by the same amount, and the sum becomes easy.
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
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🏁 Lesson 3 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass — and beat the clock: finish within 2 min 30 s.
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