Without a calculator add the following two numbers: 79 + 32. 79 is very nearly 80. Therefore

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Without a calculator add the following two numbers: 79 + 32. 79 is very nearly 80. Therefore an easier calculation would be to add 80 + 32 = 112. But because 1 was added to 79 to make the 80, it must now be subtracted from the answer.
Therefore 79 + 32 = 111.

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