When you ask "What number is halfway between 21 and 325?" 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=325.
To find the number halfway between 21 and 325, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 325 into our formula, we get:
(21 + 325)/2 = 173
Thus, the number halfway between 21 and 325 is 173.
To check that our answer is correct, we subtract 21 from 173 and subtract 173 from 325 and compare the two numbers:
173 - 21 = 152
325 - 173 = 152
As you can see, the halfway number is 152 higher than 21 and 152 lower than 325. Therefore, our halfway between answer of 173 above is correct.
Halfway Between
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Halfway Between 21 and 326
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