to write a fraction the smallest possible number do you divide or the factor or reduce?

what do you do, do you divide or factor, or reduce

You reduce I tried factor and dividing I get it wrong

What is the smallest fraction you can type using each of the digits 4 8 and nine

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reduce

you factor the top and bottom, then cancel out any factors which appear in both places.

80/12 = 4*20 / 4*3 = 20/3

Divide