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 Multiply whole numbers: word problems An apartment has 4 bedrooms. Each bedroom has 3 bookcases. How many bookcases are there in the apartment? Using addition, you can argue that there are 12 bookcases in the apartment. ( 3 + 3 + 3 + 3 = 12) However, the problem can be solved faster by doing a multiplication of 3 and 4 since 3 × 4 = 12 In general, multiplication gives the same answer as repeated addition. Sylvia's income is 500 dollars per week. How much does Sylvia makes every 16 weeks?