Multiply top lines together and same for lower lines
so 3/4 times 1/2
means top lines of each are 3 and 1 so 3x1 = 3
and lower lines are 4 and 2 so 4x2 = 8
then 3/4 x 1/2 = 3/8
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perpendicular fractions are gradients and are negative recipricals of each other and that multiply to give -1 for example:2/1 times -1/2 gives -1
multiply the numerator and the denominator by the same number, or divide each side by a common factor.
It's a proportion.
We use fractions when measuring at times such as when you're cooking or baking, and seeing how tall you are. :)
no you do not