At Sports Day, Ravi uses the near-round-number strategy to calculate 7 × 99. He thinks: "7 × 99 = 7 × 100 − 7 × 1." What is 7 × 99?
Show Worked Solution
Worked Solution
Step 1: Decompose 99 as 100 − 1.
Step 2: 7 × 99 = 7 × (100 − 1) = 7 × 100 − 7 × 1
Step 3: 7 × 100 = 700
Step 4: 7 × 1 = 7
Step 5: 700 − 7 = 693
Answer: 693
Correct answer: 693
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