When you ask "What number is halfway between 88 and 621?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=88 and Y=621.
To find the number halfway between 88 and 621, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 88 and 621 into our formula, we get:
(88 + 621)/2 = 354.5
Thus, the number halfway between 88 and 621 is 354.5.
To check that our answer is correct, we subtract 88 from 354.5 and subtract 354.5 from 621 and compare the two numbers:
354.5 - 88 = 266.5
621 - 354.5 = 266.5
As you can see, the halfway number is 266.5 higher than 88 and 266.5 lower than 621. Therefore, our halfway between answer of 354.5 above is correct.
Halfway Between
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Halfway Between 88 and 622
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