Download presentation

Presentation is loading. Please wait.

Published byDexter Wildes Modified over 2 years ago

2
Adding & Subtracting Fractions Teacher Notes: Use this presentation to teach the steps for adding and subtracting fractions with unlike denominators. It is assumed that students have a thorough understanding of the process for making equivalent fractions. CLICK HERE to view a demonstration with opportunities for students to practice making equivalent fractions.CLICK HERE

3
We need a common denominator to add these fractions.

4
7, 14, 21, 28, 35… 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 We need a common denominator to add these fractions.

5
7, 14, 21, 28, 35… 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 The first number IN COMMON that appears on both lists becomes the common denominator

6
x 2 X 7 x 7 7 6 7 + 6 = 13 13

7
We need a common denominator to add these fractions. 5, 10, 15, 20, 25, 30, 35, 40, 45 7, 14, 21, 28, 35, 42, 49, 56, 63

8
x 7 X 5 x 5 15 7 15 + 7 = 22 22

9
We need a common denominator to add these fractions. 7, 14, 21, 28, 35, 42, 49, 56, 63 8, 16, 24, 32, 40, 48, 56, 64, 72

10
x 7 x 8 32 21 32 + 21 = 53 53

11
We need a common denominator to add these fractions. 3, 6, 9, 12, 15, 18, 21, 24, 27 5, 10, 15, 20, 25, 30, 35, 40, 45

12
X 3 x 5 x 3 9 10 9 + 10 = 19 19

13
We need a common denominator to add these fractions. 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33 11, 22, 33, 44, 55, 66, 77…

14
x 11 X 3 x 3 15 22 15 + 22 = 37 37

15
We need a common denominator to add these fractions. 3, 6, 9, 12, 15, 18, 21, 24, 27 6, 12, 18, 24,…

16
x 1 X 2 x 2 4 1 4 + 1 = 5 5

17
We need a common denominator to add these fractions. 11, 22, 33, 44, 55, 66, 77… 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72

18
x 11 X 6 x 6 18 11 29 18 + 11 = 29

19
We need a common denominator to add these fractions.

20
We need a common denominator to add these fractions. 9, 18, 27, 36, 45, 54, 63, 72, 81 5, 10, 15, 20, 25, 30, 35, 40, 45

21
9, 18, 27, 36, 45, 54, 63, 72, 81 5, 10, 15, 20, 25, 30, 35, 40, 45 The first number IN COMMON that appears on both lists becomes the common denominator

22
x 5 x9 36 35 36 + 35 = 71 71 36 + 35 = 71

23
We need a common denominator to add these fractions. 12, 24, 36, 48, 60, 72, 84, 96 8, 16, 24, 32, 40, 48, 56, 64, 72, 79, 80, 88, 96

24
x 3 x 2 19 10 + 9 = 19 9 10

25
5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55 We need a common denominator to subtract a fraction from another. 11, 22, 33, 44, 55, 66, 77…

26
x 5 x 11 4 15 - 11 = 4 15 11

27
We need a common denominator to subtract one fraction from another. 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 … 10, 20, 30…

28
x 1 x 5 2 5 – 3 = 2 5 3

Similar presentations

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google