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7594 - 2831 what is the front end estimation with adjustment to estimate each difference

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Can you explain what the difference between rounding and front end estimation is?
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Use front-end estimation with or without adjustment as indicated to find the value of the expression. 4) 10,656 - 3967 (with adjustment)
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How would I go about solving this problem?

You want to estimate 5.25-3.3. Why would using front-end estimation and adjusting tell you more about the answer than rounding?
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You want to estimate 5.25-3.3 why would using front-end estimation tell you more about the answer than rounding?
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Can someone help me please, I am having a hard time understanding these three problems Clustering: 133 + 98 + 121 + 92 + 96 Substitute compatible numbers: 134 x 19 Front-end estimation with adjustment: 2,152 + 8,376
7. math Did I do it right?

Use front-end estimation to find the value of the expression. I do not understand (without adjustment) 687 - 239 (without adjustment) is this right?