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How do you add
0.50 + 0.25?
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In this lesson you will learn how to add decimals by using a
number line.
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Let’s ReviewLet’s Review
1212
14341434
0 1 2
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Let’s ReviewLet’s Review
0.5 = =
0.25 = = 0.75 = =
0.1 =
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Let’s ReviewA Common Mistake
0 1 2
l l l l l l l l l l l0 1
This number line shows fourths and halves
This number line shows tenths
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Let’s ReviewCore Lesson
I have 1.5 ounces of peanut butter left in a jar. I combine it with another jar that has 2.25 ounces of peanut butter. How much peanut
butter do I have now?
1.5 + 2.25
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Let’s ReviewCore Lesson
1.5 + 2.25?
How do you add
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Let’s ReviewCore Lesson
1.5 + 2.25
Smart estimate:1.5 = 1.50
= +2.25 +2.25
3.75
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Let’s ReviewCore Lesson
1.5 + 2.25
0.5 + 0.25
42 30 1
+1 +2 = 3.75
This matches our smart estimate
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In this lesson you have learned how to add decimals by using a
number line.
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Let’s ReviewGuided Practice
You walk 1.25 miles to your friend’s house. Then you both walk to the park 0.5 miles away. How far do you walk altogether?
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Let’s ReviewExtension Activities
Use a number line to show the addition of three common decimals.
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Let’s ReviewExtension Activities
Explain why you can add the numbers in any order and get the same answer. Back up your answer with at least 2 different number line drawings.
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Let’s ReviewExtension Activities
Your recipe calls for cup of milk, cup of water, and 1 cups of apple juice. Change these fractions to decimals and use a number line to show how much liquid this is altogether.
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Let’s ReviewQuick Quiz
Use a number line to find the answer to these problems:0.5 + 1.25 =
2.25 + 1.75
A. 1.50 B. 1.75 C. 1.3
A. 4.25 B. 3.75 C. 4