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Example of estimating sums using compatible numbers to simplify addition.

A diagram showing the actual sum of 58 + 13 = 71 and the estimated sum using compatible numbers, where 58 + 12 = 70, with a purple lamp illustration on the side.

A diagram showing the actual sum of 58 + 13 = 71 and the estimated sum using compatible numbers, where 58 + 12 = 70, with a purple lamp illustration on the side.

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