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

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

3. copyright@Ed2netLearning,Inc3 Numerator and Denominator Numerator – The number above the bar in a fraction. Denominator – The number below the bar in a fraction. 4 numerator 5 denominator

4. copyright@Ed2netLearning,Inc4 Subtracting Fractions Subtracting Fractions – Finding the difference of the fractions having like denominators. Example – To subtract 6/11 – 2/11

5. copyright@Ed2netLearning,Inc5 Difference The answer in a subtraction problem is termed as difference. Example – To subtract 10/15 – 2/15

6. copyright@Ed2netLearning,Inc6 Subtraction Fractions : Model To Subtract 7/15 - 1/15 Step 1:Use seven 1/15 fraction pieces to show 7/15 Step 2: Take away one 1/15 fraction piece. Step 3: Count the number of remaining 1/15 fraction pieces to find the difference.

7. copyright@Ed2netLearning,Inc7 7/15 – 1/15 = 6/15 1/15 1/5 1/15

8. copyright@Ed2netLearning,Inc8 Difference of fractions 8/12 – 4/12 Step 1: Put the fractions in an order. 8/12 – 4/12 Step 2: Subtract the numerators 8 – 4 = 4 Step 3: Write the difference over the common denominator 8/12 – 4/12 = 4/12 Step 4: Write the fraction in simplest form 8/12 – 4/12 = 1/3

9. copyright@Ed2netLearning,Inc9 Find the difference of 11/18 – 2/18 Solution : 11/18 – 2/18 = (11 – 2)/18 = 9/18 = 1/2

10. copyright@Ed2netLearning,Inc10 Which is not possible? a) 1/15 – 4/15 b) 8/17 – 15/17 c) Both are possible d) Both are not possible

11. copyright@Ed2netLearning,Inc11 Important Tips To subtract the fractions, subtract the numerators and write the difference over the common denominator. The smaller fraction is subtracted from the greater fraction.

12. copyright@Ed2netLearning,Inc12 How many fraction models will you need to show 5/9 – 4/9? Which ones will you need? Answer – 5 fraction models of 1/9 strips are required

13. copyright@Ed2netLearning,Inc13 Practice Problems

14. copyright@Ed2netLearning,Inc14 Which is closer to 1? a) 5/18 – 1/18 b) 9/18 – 6/18 c) 8/18 – 4/18 d) 18/18 – 1/18

15. copyright@Ed2netLearning,Inc15 Dab has 3/5 cup of mixed juice. He drank 1/5 cup of juice. How much juice is left?

16. copyright@Ed2netLearning,Inc16 Find the value of n 8/12 - 2/12 = n a) 1/2 b) 1/5 c) 1/6 d) None of the above

17. copyright@Ed2netLearning,Inc17 Which is greater? a) 8/14 – 4/14 b) 3/14 + 1/14 c) 7/14 – 3/14 d) 1/14 + 4/14

18. copyright@Ed2netLearning,Inc18 ASSESSMENT

19. copyright@Ed2netLearning,Inc19 1.What number sentence is modeled by fraction models for 3/5 with 1 strip crossed out? a) 3/5 -3/5 b) 3/5 – 1/5 c) 3/5 – 2/5 d) None of the above

20. copyright@Ed2netLearning,Inc20 2.Compare using 2/10  4/10 - 1/10

21. copyright@Ed2netLearning,Inc21 3.Subtract 4/11 from 9/11.

22. copyright@Ed2netLearning,Inc22 4.A box of beads fell on the floor. 7/12 of crayons fell out. What fraction of crayons are still in the box?

23. copyright@Ed2netLearning,Inc23 5.May has a greatest book collection. 5/14 collection is from Europe and 3/14 collection is from Russia. How much more of the collection is from Europe than from Russia?

24. copyright@Ed2netLearning,Inc24 6.A Cook needs 3/4 cup of cocoa powder and 2/4 cup of grated cheese for a special crunchy cake. How much less grated cheese is required than cocoa powder?

25. copyright@Ed2netLearning,Inc25 7.Lorrie found 8/16 of Pineapple Pie in a box. He ate 7/16 of pie. What fraction of the pie was left?

26. copyright@Ed2netLearning,Inc26 8.Find the missing number. 8/14 – 2/14= /7

27. copyright@Ed2netLearning,Inc27 9.Subtract the following. 1/16 1/16 1/16 1/16 1/16 1/16 1/16 1/16

28. copyright@Ed2netLearning,Inc28 10.Wilson ran 5/20 of a mile. Rock ran 3/20 of a mile. In the simplest form, how much farther did Wilson ran more than Rock?

29. copyright@Ed2netLearning,Inc29 Recap Numerator and Denominator Difference Subtract Fractions with like denominators Using Model to find the difference Important Tips Solved Examples Assessment

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