Explain how to use benchmarks to estimate 0.28 + 0.71

Hello! Benchmark is a synonymous term to rounding. Let's round the 0.28 rounds up to 0.3 and 0.71 rounds down to 0.7. 0.3 + 0.7 = 1, therefore the answer is 1. I hope this helps! Feel free to rate my answer.

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