Multiply the number by 2 and then divide by 5 or, more simply, multiply by 4 and move the decimal point one place to the left.
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2 and 4 fifths
1/5+2/5 = 3/5
5 and 2 ninths is 23 ninths. 2 and 2 fifths is 12 fifths. multiply the denominator and the numerator and then add the whole number over the denominator.
2\5
2/5 = 4/10 = 0.4