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by crossing out numbers like it it is 7/14 * 2/5= 7/35

You cross out when you see the same number as a factor on top and bottom.

e.g.: 2/2 simplifies to 1

4/2 = (2x2)/2 = 2

12/6 = (2x2x3)/(2x3) = (2x3)/3 = 2

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