When you ask "What number is halfway between 87 and 628?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=87 and Y=628.
To find the number halfway between 87 and 628, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 628 into our formula, we get:
(87 + 628)/2 = 357.5
Thus, the number halfway between 87 and 628 is 357.5.
To check that our answer is correct, we subtract 87 from 357.5 and subtract 357.5 from 628 and compare the two numbers:
357.5 - 87 = 270.5
628 - 357.5 = 270.5
As you can see, the halfway number is 270.5 higher than 87 and 270.5 lower than 628. Therefore, our halfway between answer of 357.5 above is correct.
Halfway Between
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Halfway Between 87 and 629
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