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65 ∗ 7 = 65 ∗ ( 1 + 1 + 1 + 1 + 1 + 1 + 1 ) = 65 + 65 + 65 + 65 + 65 + 65 + 65 = 455 because she did 65 sit ups each day a week and the week has 7 days.
Using the distributive property, we represent the total sit-ups Marla did as 65 × 7 , which can be expanded to 65 + 65 + 65 + 65 + 65 + 65 + 65 . This results in a total of 455 sit-ups over the week.
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