fraction no, 4 can simplify to 1/3 ( cancel by 4)

fraction no 6 can simplify to 1/2 (cancel by 3)

7) 4/8 -1/4 =4/8 -2/8 = 2/8 = 1/4

8) 4/10 -1/5= 4/10 -2/10 = 2/10 = 1/5

9) 9/9 -2/3 = 9/9 -6/9 =3/9 = 1/3

10) 9/15 -1/3 = 9/15 -5/15 =4/15

11) 4/12 - 1/6 = 4/12 -2/12 =2/12 =1/6

12) 14/20 -3/5 = 14/20 -12/20 = 2/20 = 1/10

13) 3/4 -9/12 =9/12 -9/12 = 0 does not need any more= already 3/4 full

14)4/8 -2/16 = 8/16 -2/16 = 6/16 =3/8 left

15) D the solution is the same as 227 -150

16) otherwise the pieces(the denominators) would be of different sizes so you cannot add or subtract or compare them

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