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copyright@Ed2netLearning,Inc 1
ADDING AND SUBTRACTING DECIMALS (2)
GRADE 3
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Hello, How are you doing?Today, we are going to start a new lesson on
Decimals.
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Using Models to subtract• Use one color for the greater number.• Take away the number to be subtracted.• The left number is the difference.
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Steps for Subtraction• Start with the hundredths.• subtract the tenths.• Subtract each place. Regroup if needed.• Place the decimal point between the
tenths and the ones in the difference.
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Subtract 0.5 from 0.9 using Model.
0.9 - 0.5 = 0.4
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Subtract 1.4 from 2.5.
2.5 - 1.4
1.1
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Is Subtracting Decimals like subtracting Whole numbers?• Subtracting Decimals is like subtracting
Whole numbers.• Start with the digits farthest to the right,
then subtract.• Regroup if necessary.
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Subtract 0.65 – 0.26
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Subtract 0.5 – 0.3
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An Adult’s toothbrush is 12.9 cm long while a child’s toothbrush is 9.8 cm long. How much longer is an adult’s toothbrush?
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Line up the decimal number, 12.36 – 0.29 for subtraction.
12.36 - 0.29
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A bag containing Oranges and Grapes weigh 14.9 pounds. If oranges weigh 9.9 pounds, what is the weight of grapes?
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Subtract 8.11 – 2.95
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Subtract 0.96 – 0.87 using model.
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Which is greater?a) 0.69 – 0.25b) 0.69 – 0.22c) 0.69 – 0.24d) 0.69 – 0.23
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What should be taken away from 1.59 to get 0.87?
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Which is not correct?a) 16.9 – 8.9 = 8.0b) 16.9 – 8.9 = 7.9c) 16.9 – 8.9 =8d) 16.9 – 8.9 = 8.00
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ASSESSMENT
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1. What is the difference for 5.23 – 3.55?
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2. The milometer of the Paul’s car shows 62.3 Km. How much farther does he have to ride to reach 62.5 Km?
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3. Which is true?a) 3.4 – 2.1 = 1.5b) 3.4 – 2.1 = 1.3c) 3.4 – 2.1 = 0.3d) 3.4 – 2.1 = 13.1
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4. Alee had $11.60. He spend $4.65 on a T-shirt. How much money was left with him?
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5. Subtract 0.24 – 0.06 using model.
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6. In a box of cookies, 0.65 of the cookies are chocolates. What decimal amount represents all the other cookies except chocolate?
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7. Mr. John takes the train to the museum. Train ticket costs $14.75. He paid the cashier $15 bill. How much money he get back?
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8. The winning team got a score of 30.5 points. The team that came second got a score of 25.9 points. By how many points did the winning team win?
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9. Subtract 1.5 – 0.99
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10. What should be added to 3.9 to get 5?
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Recap• Models to subtract• Subtraction Rules• Subtracting Decimals like subtracting
Whole numbers.• Solved Examples• Practice Problems
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Well Done!Now practice worksheets on the Lesson.