When you divide 21 by 2, you get the quotient of 10.5. This is because 21 divided by 2 equals 10.5. In mathematical terms, 21 ÷ 2 = 10.5. The result is a decimal because 21 is not evenly divisible by 2.
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Because 2 goes into 21 ten times - with 1 remaining - so you divide the 1 by 2 to get an exact answer ! 1 divided by 2 is 1/2 or 0.5 as a decimal !