Select all the expressions that have a difference of less than 1/2 7/10 -1/8, 17/20 -3/10, 17/18 -2/3,17/18-2/3,21/25-7/20

Answer 1

7/10 -1/8 = 28/40 -5/40 = 23/40 > 1/2

17/20-3/10 = 17/20-6/20 = 11/20 > 1/2

17/18 -2/3 = 17/18 - 12/18 = 5/18 < 1/2

21/25 -7/20 = 84/100 - 35/100 = 49/100< 1/2

the last two are less than 1/2