When you ask "What number is halfway between 21 and 662?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=662.
To find the number halfway between 21 and 662, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 662 into our formula, we get:
(21 + 662)/2 = 341.5
Thus, the number halfway between 21 and 662 is 341.5.
To check that our answer is correct, we subtract 21 from 341.5 and subtract 341.5 from 662 and compare the two numbers:
341.5 - 21 = 320.5
662 - 341.5 = 320.5
As you can see, the halfway number is 320.5 higher than 21 and 320.5 lower than 662. Therefore, our halfway between answer of 341.5 above is correct.
Halfway Between
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Halfway Between 21 and 663
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