2 ÷ 1/2 = 2 x 2/1 = 4
Alternatively:
1 whole is 2 halves
→ 2 wholes = 2 x 2 halves = 4 halves.
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5 wholes = ten halves plus one half = 11 halves
There are 16 halves in eight wholes.
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 halves in 5 wholes.
You can make 4 wholes from 8 halves.