8.5 is a decimal.
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8 hours per day for 5 days per week = 40 hours per week. 40 is a number in decimal form. All that is meant by decimal form is that the place value of each digit is ten times the place value of the digit to its right.
You need at least two whole numbers to find a GCF, not one decimal. If that's 5 and 6, the GCF is 1.
21/24 = 7/8 = 0.875 in decimal
The mathematical symbol you're thinking of is the "decimal point" or simply the "dot." When placed between 5 and 9, it is used to represent a decimal number that is greater than 5 and smaller than 9. For example, if you have 5.7, it's greater than 5 but less than 9.
A terminating decimal so a rational fraction.