Which is the best estimate for 5.12 + 3.87?
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Rounding to whole numbers gives 5 + 4 = 9, which is also close to the exact sum 8.99. The estimate 1 comes from subtracting the benchmarks, and 90 loses the decimal scale.
Rounding to whole numbers gives 5 + 4 = 9, which is also close to the exact sum 8.99. The estimate 1 comes from subtracting the benchmarks, and 90 loses the decimal scale.