SFAW Mathematics Chapter 1  Lesson 1-12  Page 38  
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Lesson 1-12
 Key Idea
 You can use place
value to add
decimals.
  Adding Decimals WARM UP
LEARN
  How can you add decimals?
TEST TALK Mrs. Piper combined two packages of ground beef to make hamburgers. One package had 0.25 pound of beef. The other had 0.37 pound. How much ground beef did she have in all?
Example A
STEP 1 Add 0.25 + 0.37.Estimate: 0.3 + 0.4 = 0.7
What You Think
What You Write
Write the
numbers, lining
up the decimal
points.
STEP 2
Add the hundredths. Regroup.
STEP 3
Add the tenths. Write the decimal point in the answer.
Mrs. Piper had 0.62 pound of ground beef in all.
Example B
Add 2.8 + 1.765. Estimate: 3 + 2 = 5
STEP 1 STEP 2
Write the numbers. Line up the decimal points. Write zeros to show place value.
Add as you would whole numbers. Bring the decimal point straight down in the answer.
Talk About It
1.  Is the sum 0.62 reasonable in Example A? Explain.
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