Adding and Subtracting Decimals

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Presentation transcript:

Adding and Subtracting Decimals LESSON 1-7 Additional Examples First estimate and then find the sum 6.8 + 4.65 + 2.125. Estimate 6.8 + 4.65 + 2.125 7 + 5 + 2, or 14 Add. 6.800 Line up the decimal points. 4.650 Write zeros so that all decimals have + 2.125 the same number of digits to the right 13.575 of the decimal point. Check for Reasonableness The sum 13.575 is reasonable since it is close to 14.

Adding and Subtracting Decimals LESSON 1-7 Additional Examples Use front-end estimation and adjust to estimate each sum. a. 25.1 + 33.2 + 71.0 25.1 Add the front-end digits. 33.2 71.0 + 129 +0 Adjust for the other amounts. The total is about 129. b. $4.99 + $2.95 4.99 Add the front-end digits. Adjust for the cents. .99 about $1 2.95 + 6 + 2 .95 about $1 The total is about $6 + $2, or $8.

Adding and Subtracting Decimals LESSON 1-7 Additional Examples Professional ice hockey rinks can be from 25.9 m to 30.0 m wide. What is the difference between these widths? Estimate 30.0 – 25.9 30 – 26, or 4 Subtract. 30.0 Rename 30 as 29 and 10 tenths. – 25.9 Subtract 25.9. 4.1 Simplify. 29 10 The difference between the widths is 4.1 m. Check for Reasonableness The difference 4.1 is reasonable since it is close to 4.