Question

1) 7/15-2/5 2)11/21-3/14 3)6/7-9/14 4)9/20-5/12 5)5/9-3/8 6)7/9-5/12 7)7/18-1/45 8)11/42-5/28

Answer 1

1) 7/15 - 2/5 = 7/15 - 6/15 = 1/15

2) 11/21 - 3/14 = 22/42 - 9/42 = 13/42

3) 6/7 - 9/14 = 12/14 - 9/14 = 3/14

4) 9/20 - 5/12 = 27/60 - 25/60 = 2/60 = 1/30

5) 5/9 - 3/8 = 40/72 - 27/72 = 13/72

6) 7/9 - 5/12 = 28/36 - 15/36 = 13/36

7) 7/18 - 1/45 = 35/90 - 2/90 = 33/90 = 11/30

8) 11/42 - 5/28 = 22/84 - 15/84 = 7/84 = 1/12

Answer 2

To subtract fractions, you need to find a common denominator and then perform the subtraction. Here are the results for each of the subtraction problems:

1. (7/15) - (2/5): To find a common denominator, you can use 15. Rewrite 2/5 with a denominator of 15: (7/15) - (6/15) = (7 - 6)/15 = 1/15.

2. (11/21) - (3/14): The common denominator can be 42. Rewrite 11/21 and 3/14 with a denominator of 42: (22/42) - (9/42) = (22 - 9)/42 = 13/42.

3. (6/7) - (9/14): The common denominator is 14. Rewrite 6/7 with a denominator of 14: (12/14) - (9/14) = (12 - 9)/14 = 3/14.

4. (9/20) - (5/12): The common denominator can be 60. Rewrite 9/20 and 5/12 with a denominator of 60: (27/60) - (25/60) = (27 - 25)/60 = 2/60, which can be simplified to 1/30.

5. (5/9) - (3/8): The common denominator is 72. Rewrite 5/9 and 3/8 with a denominator of 72: (40/72) - (27/72) = (40 - 27)/72 = 13/72.

6. (7/9) - (5/12): The common denominator can be 36. Rewrite 7/9 and 5/12 with a denominator of 36: (28/36) - (15/36) = (28 - 15)/36 = 13/36.

7. (7/18) - (1/45): The common denominator can be 90. Rewrite 7/18 and 1/45 with a denominator of 90: (35/90) - (2/90) = (35 - 2)/90 = 33/90, which can be simplified to 11/30.

8. (11/42) - (5/28): The common denominator can be 84. Rewrite 11/42 and 5/28 with a denominator of 84: (22/84) - (15/84) = (22 - 15)/84 = 7/84, which can be simplified to 1/12.