Estimating Sums and Differences of Decimals

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Presentation transcript:

Estimating Sums and Differences of Decimals

Rules for Rounding Round down  4 or below, let it go! 4, 3, 2, 1, 0 Keep it. Round up  5 or above, give it a shove! 5, 6, 7, 8, 9 Increase it.

Use place value when rounding. Underline the digit to be rounded. Circle the digit to the right of the underlined digit. Draw an arrow from the circled digit to the underlined digit. Does the circled digit tell you to round up or down? Round the underlined digit.

Estimate each sum or difference. 1.15 + 16.61 20.8 + 7.44 79.98 + 0.93 19.74 – 1.15 30.86 – 5.37 60.93 – 9.53