Estimate the sum or difference. use the benchmarks, 0 1/2, and 1. 1. 23/40 - 11/30estimate the sum or difference. use the benchmarks, 0 1/2, and 1. 1. 23/40 - 11/30estimate the sum or difference. use the benchmarks, 0 1/2, and 1. 1. 23/40 - 11/30

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