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The LCD for working with those fractions is 8 (or 1/8)
280
1/2 = 50%
1 over8+3over4
3 over 8 1 over 8
7/2 or 3.5
3/4 > 1/2
No.
3/5 - 1/2 = 1/10
10 - 41/2 = 51/2
2 over4, 1 over2
1/2 ÷ 7/8 = 4/7
14/2