math help?

Question

1.Add:
2/3 + 5/4

2.use (equal) or (not equal) to write a true sentence:
6+2 over 6 ( ) 3 over 1

3.subtract:
4 - 3/4


4.write 1.15 as a reduced fraction

5.write 0.225 as a reduced fraction

6.simplify:
(3 - 1/3) x 6/7

7.subtract:
6 1/3 - 5 1/2

8.divide:
4/5 divided by 20

9.multiply:
3/4 x 2 1/4

Answer 1

1. 2/3 + 5/4 = 8/12 + 15/12 = 23/12 (= 1 11/12)

2. (6 + 2)/6 = 8/6 = 4/3
3/1 = 9/3
Therefore (6 + 2)/6 (NOT EQUAL) 3/1

3. 4 - 3/4 = 16/4 - 3/4 = 13/4 (= 3 1/4)

4. 1.15 = 115/100 = 23/20 (divide top and bottom by 5)

5. 0.225 = 225/1000 = 9/40 (divide top and bottom by 25)

6. (3 - 1/3) x 6/7 = (9/3 - 1/3) x 6/7
= 8/3 x 6/7
= 8/1 x 2/7
= 16/7 (= 2 2/7)

7. 6 1/3 - 5 1/2 = 19/3 - 11/2
= 38/6 - 33/6
= 5/6

8. (4/5)/20 = 4/5 x 1/20
= 4/(5 x 20)
= 4/100
= 1/25

9. 3/4 x 2 1/4 = 3/4 x 9/4
= (3 x 9)/(4 x 4)
= 27/16 (= 1 11/16)

Answer 2

1. 2/3 +5/4 = 8/12 + 15/12 = 23/12

2. (6+2)/6 is not equal to 3/1

3. 4 - 3/4 = 16/4 - 3/4 = 13/4

4. 1.15 = 23/20

5. .225 = 9/40

6. (3 - 1/3)(6/7) = (9/3 - 1/3)(6/7) = (8/3)(6/7) = 48/21 = 16/7

7. 6 1/3 - 5 1/2 = 19/3 - 11/2 = 38/6 - 33/6 = 5/6

8. (4/5)/20 = (4/5)(1/20) = 4/100 = 1/25

9. (3/4)(2 1/4) = (3/4)(9/4) = 27/16

Answer 3

2/3 + 5/4 =

8/12 + 15/12 =

23/12

- - - - - - - -s-

Answer 4

1) 23/12
2) ??????
3) 13/4
4) 23/20
5) 9/40
6) 16/7
7) -31/6
8) 16
9) 63/8

Answer 5

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