Four fifths.
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one fifteenth
one twentieth 1 / 5 x 1 / 4 = (1 x 1) / (5 x 4) = 1 /20
one twenty-fifth = 4%1/25:= 1 ÷ 25= 0.04 in decimal= 0.04 * 100%= 4%
One-fifth in decimal form is .20, because 5 times .20 is one whole. Hope this helps!
1/5 + 1/4 = 4/20 + 5/20 = 9/20 or 0.45