When you ask "What number is halfway between 88 and 821?" 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=821.
To find the number halfway between 88 and 821, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 88 and 821 into our formula, we get:
(88 + 821)/2 = 454.5
Thus, the number halfway between 88 and 821 is 454.5.
To check that our answer is correct, we subtract 88 from 454.5 and subtract 454.5 from 821 and compare the two numbers:
454.5 - 88 = 366.5
821 - 454.5 = 366.5
As you can see, the halfway number is 366.5 higher than 88 and 366.5 lower than 821. Therefore, our halfway between answer of 454.5 above is correct.
Halfway Between
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Halfway Between 88 and 822
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