What is 501 - 198 calculated mentally?
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Worked Solution
Step 1: Round 198 up to 200 (add 2 to round).
Step 2: Subtract: 501 - 200 = 301.
Step 3: You subtracted 2 more than needed, so add 2 back: 301 + 2 = 303.
501 - 198 = 303.
Correct answer: 303
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