5 + 5 x 8 = 45
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210 - (20+5)*8 = 210 - 25*8 = 210 - 200 = 10
2/5 - 3/8 = (2x8)/(5x8) - (5x3)/(5x8) = 16/40 - 15/40 = 1/40
1 5/8 + 5 5/7= 1 5x7/8x7 + 5 5x8/7x8= 1 35/56 + 5 40/56= 6 75/56= 7 19/56
Find a common denominator (40 is a good choice in this case):3/10 + 1/5 + 1/8 = 3x4/10x4 + 1x8/5x8 + 1x5/8x5= 12/40 + 8/40 + 5/40= 12+8+5/40= 25/40= 5x5/8x5= 5/8
4 / 5 x 7 / 8 = 4x7 / 5x8 = 28 / 40 = 7 / 10 seven tenths