5
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Half of one twentieth is equal to one fortieth.
One half times 10 is equal to 5. This is because multiplying one half (or 0.5) by 10 results in 5. In fractional terms, it can be calculated as ( \frac{1}{2} \times 10 = \frac{10}{2} = 5 ).
10
One half (0.5) is 5.0 × 10-1
half of one whole = 5/10