Topic 9:Understand Addition and Subtraction of Fractions

Adding Fractions

100

1/5 + 2/5

3/5

200

3/12 + 4/12

7/12

300

10/13 + 1/13

11/13

400

1/10 + 2/10 + 4/10=

7/10

500

1/10 + 5/10+ 4/10=

10/10 or 1

Decompose Fractions

100

3/5

1/5+1/5+1/5

2/5+1/5

200

4/6

1/6+1/6+1/6+1/6

2/6+2/6

3/6+1/6

300

7/8

1/8+4/8+2/8

400

1 1/3

1+ 1/3

3/3+1/3

500

1 3/4

1+ 3/4

4/4 +3/4

Subtracting Fractions

100

8/8 - 2/8

6/8

200

7/12 - 3/12

4/12

300

17/10 - 3/10

14/10 = 1 4/10

400

1/5 - 1/5

0

500

21/10 - 1/10

20/10 = 2

Adding Mixed Numbers

100

1 1/2 + 1/2

2

200

4 2/3 + 1 2/3=

7 1/3

300

6 5/12 + 4 11/12=

11 4/12

400

1 7/12 + 2 10/12=

4 5/12

500

3 6/8 + 1 3/8=

5 1/8

Subtracting Mixed Numbers

100

2 2/10 - 1 1/10=

1 1/10

200

4 4/5 - 3 3/5=

1 1/5

300

6 3/10 - 1 8/10=

4 5/10

400

7 - 3 1/10=

3 9/10

500

6 3/5 - 3 4/5=

2 4/5