3 5/8 - 2 1/4 = 1 3/8
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Three over four
2-1 = 1 1 over 4 equals .25 or 1/4
1/4 times 2 is 1/2
1 1/4 - 3/4 = (1×4+1)/4 - 3/4 = 5/4 - 3/4 = (5-3)/4 = 2/4 = (1×2)/(2×2) = 1/2
To divide fractions, turn the second upside down and multiply: 1/2 ÷ -1/4 = 1/2 x 4/-1 = 4/-2 = 4 ÷ -2 = -2