To write five and nine tenths as a decimal, you simply place the whole number part before the decimal point and the decimal part after the decimal point. Therefore, five and nine tenths is written as 5.9 in decimal form.
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5 and 9/10 as a decimal is 5.9
It is 5 + 0.9
To write nine tenths as a decimal, it looks like this: .9
6.9
40.9
12.9 IS a decimal number. It is twelve and nine tenths.