10.0
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To write 75.6 as a decimal, you simply write the whole number part followed by a decimal point and then the decimal part. In this case, 75 is the whole number part, so you write it as 75., and then add the decimal part, which is .6. Therefore, 75.6 is the decimal representation of the number 75.6.
"5" is already a decimal number. You could also write it as "5.0". A decimal is a whole number in the decimal (base-10) number system or a proper fraction whose denominator is a power of 10. Decimal numbers are written by convention with the whole-number part to the left of a "decimal point" (.) and the fractional part to the right. Either or both the whole or fractional part may be zero (0).
To write 28 10 as a decimal, you divide 28 by 10. The quotient is 2.8, so 28 10 expressed as a decimal is 2.8.
As the 82 are whole numbers, it is 82.00 as a decimal
0.4