.444444444444444444444444 (the 4s go on forever)
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It is: 4/5 = 0.8 as a decimal
0.4 is already a decimal number. To make an equivalent decimal number, you can add zeroes before or after the 4, so 0000.4 and 0.400000 are equivalent to 0.4.
4 over 9 is 4 divided by 9, which is 4/9, or 4 ninths. The decimal equivalent is 2.25
16 + 4 + 1 =21
16 over 4