When you ask "What number is halfway between 21 and 107?" 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=107.
To find the number halfway between 21 and 107, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 107 into our formula, we get:
(21 + 107)/2 = 64
Thus, the number halfway between 21 and 107 is 64.
To check that our answer is correct, we subtract 21 from 64 and subtract 64 from 107 and compare the two numbers:
64 - 21 = 43
107 - 64 = 43
As you can see, the halfway number is 43 higher than 21 and 43 lower than 107. Therefore, our halfway between answer of 64 above is correct.
Halfway Between
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Halfway Between 21 and 108
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