Explain why one half times two equals one whole

Becasue two halves add up to one and by saying one half times two, you are also saying one half plus one half

Two halfs equal one whole. think of it like this, an orange cut in half leaves you with two halfs, put them together and you have a whole. simple. multiplying by 2 just means adding a number two times.

1 half plus one half = 2halves = 1 whole

1half x 2 = 2 halves=1 whole