It is simply: 21.0
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It is: 21/50 = 0.42 as a decimal
0.021
21 in decimal form can be 21.0 or 21.00 or 21.000, or however many zeros you'd like to write after the decimal point.
It is: 21/100 = 0.21 as a decimal
To write 9.75 as a decimal, you simply write the whole number part followed by a decimal point and then the decimal part. Therefore, 9.75 can be written as 9.75 in decimal form.