5 wholes = ten halves plus one half = 11 halves
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2 ÷ 1/2 = 2 x 2/1 = 4 Alternatively: 1 whole is 2 halves → 2 wholes = 2 x 2 halves = 4 halves.
When you have 11 halves, you can think of it as having 11 parts, each of which is half of a whole. To find out how many wholes that is, you would divide 11 by 2, since there are 2 halves in a whole. Therefore, 11 halves is equal to 5 wholes with 1 half remaining.
10 / (1/2) = 10* (2/1) = 20
Well, if there are 2 halves in 1 whole, 2x4=8. Or you could count as 2, 4, 6, 8.
It is 1/42.