the answer is 10 and 1/2 because half of 20 is 10, but you still have 1 left, so you half that which is 1/2.
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21/2=10.5 So 10.5 is the half of 21
Half of (21 over 25) = 1/2 * 21/25 = 21/50 = 0.42
To find half of 84, you divide 84 by 2, which equals 42. To find half of 42, you divide 42 by 2 again, which equals 21. Therefore, a half of a half of 84 is 21.
42 ÷ 2 = 21 centimetres (Therefore, half of 42 is 21.)
A half of 42 is 42/2 = 21