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Estimating and Computations

Estimating and Computations. Different Types Of Estimation. Rounding to a Place Value Front End Estimation Round to Greatest Place Round to Lesser Place Estimating with Compatible Numbers. Rounding to a Place Value. We learned last week. Example round to the nearest tenth 45. 7 9

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Estimating and Computations

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  1. Estimating and Computations

  2. Different Types Of Estimation • Rounding to a Place Value • Front End Estimation • Round to Greatest Place • Round to Lesser Place • Estimating with Compatible Numbers

  3. Rounding to a Place Value • We learned last week. • Example round to the nearest tenth • 45.79 • Rounding to the tenths place during computations 65.45 + 11.12 76.57 45.8 • 65.5 • + 11.1 • 76.6

  4. Front End 567 = 500 + 612 = 600 1179 1100 Three Types • Greater Place 567 = 600 + 612 = 600 1179 1200 • Lesser Place 567 = 570 + 612 = 610 1179 1180 • Rounding to front end gives lowest number • Rounding to greatest place gives greatest number • Rounding to lesser place gives closest number

  5. Front End Estimation • Front End Estimation-Underlinethe digit at the front. (the greatest place). Change every number to the right of the underline to zeros. • Example: 45,757 40,000 • Practice: 506,766 467 2,345,434

  6. 36,656 + 23,455 60,111 568 - 344 224 30,000 + 20,000 50,000 500 - 300 200 Front End Estimation Computations

  7. Round to Greatest Place • Round to the Greatest Place-Underlinethe digit in the greatest place. Draw an arrow to the digit to its right. Then use your rounding rules. • Example: 45,757 50,000 • Practice: 506,766 467 2,345,434

  8. 36,656 + 23,455 60,111 568 - 344 224 40,000 + 20,000 60,000 600 - 300 300 Rounding to the Greatest Place Computations

  9. Rounding to Lesser Place • Round to the Lesser Place-Underline a digit in a lesser place. Draw an arrow to the digit to its right. Then use your rounding rules. • Example: 45,757 46,000 • Practice: 506,766 467 2,345,434

  10. 36,656 + 23,455 60,111 568 - 344 224 37,000 + 23,000 60,000 570 - 340 230 Rounding to the lesser Place Computations

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