Ravi uses the compensation method to work out 56 − 19. He subtracts 20 from 56 first. What must he do next to get the correct answer?
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Worked Solution
Step 1: Use the compensation method. Instead of subtracting 19, subtract 20 (which is 1 more).
56 − 20 = 36
Step 2: Since we subtracted 1 too many, add 1 back.
36 + 1 = 37
Step 3: Check: 56 − 19 = 37. ✓
Answer: Ravi must add 1 to get 37.
Correct answer: Add 1 to get 37
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