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Estimating With Decimals

Estimating With Decimals. Rounding. Identify the place you are rounding to, and place a box around it. Check the digit to the right. Apply basic rounding rules (5 or greater increase by 1, 4 or less stays the same) Keep everything before the box the same. Everything after the box becomes zero.

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Estimating With Decimals

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  1. Estimating With Decimals

  2. Rounding • Identify the place you are rounding to, and place a box around it. • Check the digit to the right. Apply basic rounding rules (5 or greater increase by 1, 4 or less stays the same) • Keep everything before the box the same. Everything after the box becomes zero

  3. Example: Round 4,525 to the nearest hundreds place. __ , __ __ __ 4 0 0 4,525 5

  4. Example 2: Round 13.56 to the nearest tenths place. __ __ . __ __ 1 3 6 0 13.56 13.6 is the answer.

  5. Estimating the Nearest Whole Number • Most of the time, you will be asked to round to the nearest whole number. • Round to the ones place, and drop the decimal part of your number.

  6. Example: Estimate the sum of 10.93 and 3.25. 11 11.00 10.93 3.00 3 3.25 + 14

  7. Front End Estimation • Add the “front-end” digits, ignoring the decimals. • Estimate the decimals. • Add the decimal estimate to the front-end sum.

  8. Example 5.45 9.89 3.53 6.03 Front-end: 5 + 9 + 3 + 6 = 23 • Decimals: • .89 is close to 1. • .03 is close to 0. • .45 + .53 is close to 1. • 1 + 0 + 1 = 2 + About 25 Put the front-end with the decimal: 23 + 2 = 25.

  9. Homework Time The above image is a royalty free picture provided by http://www.bigfoto.com

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