Adding and Subtraction with like Denominators

Addition

100

1/3 + 1/3 =

2/3

200

2/9  +  4/9

6/9

300

6/9 + 3/9 =

9/9 or 1

400

1/4 + 2/4 =

3/4

500

12/8 + 3/8 =

15/8 or    1 & 7/8

Subtraction

100

11/15  -  2/15 =

9/15

200

10/10 - 9/10 =

1/10

300

20/20 - 10/20 =

10/20 or 1/2

400

8/19 - 4/19 =

4/19

500

2/5 - 0/5

2/5

Mixed

100

2/3 - 2/3 =

0

200

8/15 + 3/15 + 1/15 = 

12/15

300

(6/9 - 5/9) + 1/9 =

2/9    because (1/9) + 1/9 = 2/9

400

19/20 + 1/20 =

20/20 OR 1

500

91/100 + 9/100 =

100/100 or 1

Question

100

5/5 is equal to what whole number?

1

200

What do we call the TOP number of a fraction?

NUMERATOR

300

What do we call the BOTTOM number of a fraction?

DENOMINATOR

400

True or False? 

3/3  5/5  and 1/1 all equal 1

TRUE

500

The NUMERATOR in a fraction represents the _____ number.

TOP

Challenge

100

0 - 1/3 =

0

200

3/3 - 1

 0

300

8/9 - 3/9 - 1/9 =

4/9

400

1/3 + 1/3 + 1/3

3/3 or 1

500

8/9 + 1/9

 9/9 or 1