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Lesson 2-3

Lesson 2-3. Estimating Sums and Differences. Front End Estimation. The process of looking at the front digit of a number and estimating to find the sum or difference. What is the front digit of the following numbers? 1,248 + 2,579 ______. Using Front End Estimation to Estimate Sums.

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Lesson 2-3

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  1. Lesson 2-3 Estimating Sums and Differences

  2. Front End Estimation The process of looking at the front digit of a number and estimating to find the sum or difference. What is the front digit of the following numbers? 1,248 + 2,579 ______

  3. UsingFront End Estimation to Estimate Sums 1,329+388= 1,329 becomes 388 becomes Now Estimate:

  4. UsingFront End Estimation to Estimate Sums Estimate the sum using front end estimation 788 32,910 + 122 + 4,085 ______ _______

  5. UsingFront End Estimation to Estimate Differences 3,635-1,498= 3,635 becomes 1,498 becomes Now Estimate:

  6. UsingFront End Estimation to Estimate Differences Estimate the difference using front end estimation. 9,245 65,328 - 4,033 - 14,231 ______ _______

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