3-2 Estimating Decimals Warm Up Order the decimals from least to greatest , 18.7, , 9.66, 9.6, Write each in words , 18.7, , 9.076, 9.6, 9.66 three and seventy-two thousandths six and one thousand two hundred fifty-eight ten-thousandths

3-2 Estimating Decimals MA.6.A.5.2 Estimate the results of computations with…decimals…and judge the reasonableness of the results. Sunshine State Standards

3-2 Estimating Decimals When numbers are about the same value, you can use clustering to estimate. Clustering means rounding the numbers to the same value.

3-2 Estimating Decimals Additional Example 1: Health Application Nancy wants to cycle, ice skate, and water ski for 30 minutes each. About how many calories will she burn in all? (Cycling = calories, ice skating = calories, and water skiing = calories) The addends cluster around To estimate the total number of calories, round each addend to Add. 510 Nancy burns about 510 calories.

3-2 Estimating Decimals Check It Out: Example 1 Abner wants to run, roller-skate, and snow ski for 60 minutes each. About how many calories will he burn in all? (Running = calories, roller-skating = calories, and snow skiing = calories.) 190 × 3 = 570 calories