If a number has no decimal you can add a point zero zero at the end of that number.
A number without a decimal would be a number without a fraction - hence it would be a "whole number".
The word decimal comes from ten. So without the number 10, decimal would have no meaning.
6.5 + 3 + 2 = 11.5Without a decimal, you would write that as 11½
That initial zero at the far left is unnecessary and it doesn't meant anything, but without it your binary would be 1010101 and your decimal would be 85.
11
0.10, to the nearest whole number - ie without a decimal - is zero.
1.0 if the same number is permitted. If not, there is no such thing as a CLOSEST decimal. If you are given one decimal with the claim of being the closest, the average of that number and 1 will be a decimal that is closer. Without averaging, the closest would be 0.999 with infinite 9s
To multiply two digit decimal numbers, multiply the numbers as you would without the decimals. To put the decimal in the answer, count the number of decimal places in the two numbers and put the decimal in the answer that many places to the left. For example: 5.12 x 6.35 = 32.5120. If the numbers were 51.2 x 63.5, the answer would be 3251.20.
Half of 81 without a decimal point would be 40.5. Dividing 81 by 2 gives you 40.5 as the result. Since you specified no decimal point, the answer would be 40.5.
1.6667
87.5 is already a decimal.
It is a repeating decimal.