1. copyright@Ed2netLearning,Inc1 ADDING AND SUBTRACTING DECIMALS (2) GRADE 3

2. copyright@Ed2netLearning,Inc2 Hello, How are you doing? Today, we are going to start a new lesson on Decimals.

3. copyright@Ed2netLearning,Inc3 Using Models to subtract Use one color for the greater number. Take away the number to be subtracted. The left number is the difference.

4. copyright@Ed2netLearning,Inc4 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.

5. copyright@Ed2netLearning,Inc5 Subtract 0.5 from 0.9 using Model. 0.9 - 0.5 = 0.4

6. copyright@Ed2netLearning,Inc6 Subtract 1.4 from 2.5. 2.5 - 1.4 1.1

7. copyright@Ed2netLearning,Inc7 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.

8. copyright@Ed2netLearning,Inc8 Subtract 0.65 – 0.26 Answer – 0.39

9. copyright@Ed2netLearning,Inc9 Subtract 0.5 – 0.3 Answer- 0.2

10. copyright@Ed2netLearning,Inc10 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? Answer – 3.1 cm

11. copyright@Ed2netLearning,Inc11 Line up the decimal number, 12.36 – 0.29 for subtraction. 12.36 - 0.29 Answer – 12.07

12. copyright@Ed2netLearning,Inc12 A bag containing Oranges and Grapes weigh 14.9 pounds. If oranges weigh 9.9 pounds, what is the weight of grapes? Answer – 5.0 pounds

13. copyright@Ed2netLearning,Inc13 Subtract 8.11 – 2.95 Answer – 5.16

14. copyright@Ed2netLearning,Inc14 Subtract 0.96 – 0.87 using model. Answer – 0.09

15. copyright@Ed2netLearning,Inc15 Which is greater? a) 0.69 – 0.25 b) 0.69 – 0.22 c) 0.69 – 0.24 d) 0.69 – 0.23

16. copyright@Ed2netLearning,Inc16 What should be taken away from 1.59 to get 0.87? Answer – 0.72

17. copyright@Ed2netLearning,Inc17 Which is not correct? a) 16.9 – 8.9 = 8.0 b) 16.9 – 8.9 = 7.9 c) 16.9 – 8.9 =8 d) 16.9 – 8.9 = 8.00

18. copyright@Ed2netLearning,Inc18 ASSESSMENT

19. copyright@Ed2netLearning,Inc19 1.What is the difference for 5.23 – 3.55? Answer- 1.68

20. copyright@Ed2netLearning,Inc20 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? Answer- 0.2 km

21. copyright@Ed2netLearning,Inc21 3.Which is true? a) 3.4 – 2.1 = 1.5 b) 3.4 – 2.1 = 1.3 c) 3.4 – 2.1 = 0.3 d) 3.4 – 2.1 = 13.1

22. copyright@Ed2netLearning,Inc22 4.Alee had $11.60. He spend $4.65 on a T-shirt. How much money was left with him? Answer - $6.95

23. copyright@Ed2netLearning,Inc23 5.Subtract 0.24 – 0.06 using model. Answer- 0.18

24. copyright@Ed2netLearning,Inc24 6.In a box of cookies, 0.65 of the cookies are chocolates. What decimal amount represents all the other cookies except chocolate? Answer- 0.35

25. copyright@Ed2netLearning,Inc25 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? Answer- $0.25

26. copyright@Ed2netLearning,Inc26 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? Answer- 4.6 points

27. copyright@Ed2netLearning,Inc27 9.Subtract 1.5 – 0.99 Answer- 0.51

28. copyright@Ed2netLearning,Inc28 10.What should be added to 3.9 to get 5? Answer – 1.1

29. copyright@Ed2netLearning,Inc29 Recap Models to subtract Subtraction Rules Subtracting Decimals like subtracting Whole numbers. Solved Examples Practice Problems

30. copyright@Ed2netLearning,Inc30 Well Done! Now practice worksheets on the Lesson.