0.042
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4.2
to make decimal into percentage, you move the decimal 2 places to the right. so 0.42 would be 42% .4 would be 40% also it's the same for the percentage to be in decimal, but the opposite. move the decimal 2places to the left. 42% would be .42 9.7% would be .097 i hope it helped you :)
You can write any integer as a fraction, by putting 1 in the denominator. In this case, 42/1. However, it is more common to just leave it as an integer (42 in this case). 42/100
3.42 = 171/50 or 3 21/50
4.2% = 0.042