A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right.
So, a number such as 12.345
= 1*10 + 2*1 + 3*1/10 + 4*1/100 + 5*1/1000.
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It means that you find a decimal number that has the same value as the fraction - or often a value that is close, since most fractions cannot be expressed exactly with a terminating decimal. Just divide the numerator by the denominator, to get an equivalent decimal.
It would be the value of the decimal increased by 30%.
decimal value of 115.9 percent is 1.159.
The decimal value of 21 is simply 21. In decimal form, whole numbers remain the same, so the decimal value of 21 is 21.
0.01 is one hundredth. 0.001 is one thousandth.