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First, round the highest place value of each number: 400+200+700=1300

Second, round the second highest place value of each number: 390+190+740=1320

The range to estimate the sum is 1300 to 1320. The actual sum is 1321, which higher than the range. However, the actual sum may lie within the obtained range. LEF

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12y ago
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Q: How do you find a range to estimate the sum of 388 plus 192 plus 741?
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