Question

I only need help with 15,16,17,18 please help me

Answer 1

Okay, so to find like denominators you need to find a number that both denominators go into. For 15, they both go into 45. 9 goes in 5 times and 15 goes in 3 times. So multiply their numerators by 5 and 3. It would be 25/45 for 5/9 and it would be 12/45 for 4/15. Do the same for 16 and 17, for 16 they both go into 42 and for 17 they both go into 42.

Answer 2

15- 25/45 and 12/45
16- 7/42 and 8/42
16- 110/168 and 32/168
17- 21/36 and 10/36