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There are a few approaches you can take.

1. Use a calculator.

2. Use the principles of long multiplication.

3. Use a trick such as 27 times 10 is 270. 15 is half as big again as 10 so the answer must be half as big again as 270 = 270 + 135 = 405.

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Q: How can you multiply 27 times 15?
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