times the top numbers and then then bottom
2/5×2/3= 2x2/5x3 = 4/8 =1/2
-1/5×(-5/6)= -1 x -5 / 6 x 6 = 5/12
-1/12×2/5= -1 x 2 / 12 x 5 = -2/60 = - 1/30
4/7×7/8= 4 x 7 / 7 x 8 = 28/56 = 1/2
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