Siti uses mental calculation to find 63 + 28. She rounds 28 up to 30, adds 30 to 63, then adjusts. What is 63 + 28?
Show Worked Solution
Worked Solution
Step 1: Round 28 up to 30 (added 2 extra).
Step 2: Add 63 + 30 = 93.
Step 3: Subtract the extra 2 to compensate: 93 − 2 = 91.
Answer: 91
Correct answer: 91
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