Adding and Subtracting Decimals

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Presentation transcript:

Adding and Subtracting Decimals COURSE 2 LESSON 1-2 Find 2.15 + 7.632 + 16.5. Estimate 2.15 + 7.632 + 16.5 2 + 8 + 17, or 27 Align the decimal points. 2.150 7.632 + 16.500 26.282 Insert zeros so each addend has the same number of decimal places. Check for Reasonableness 26.282 is reasonable since it is close to 27. 1-2

Adding and Subtracting Decimals COURSE 2 LESSON 1-2 You have 5.08 min left on a CD. How much time will you have left after you record a 2.5 minute song? Regroup. 10 4 5.08 – 2.50 2.58 You will have 2.58 min left on the CD. 1-2

Adding and Subtracting Decimals COURSE 2 LESSON 1-2 You guess that the weight of a package is 10 lb. At the post office, the scale shows that the actual weight is 7.6 lb. Find the difference between your guess and the actual weight. Insert a decimal point and one zero. 10.0 – 7.6 Regroup. 10.0 – 7.6 9 10 Subtract. 10.0 – 7.6 2.4 9 10 Your guess is 2.4 lb more than the actual weight. 1-2