When you ask "What number is halfway between 87 and 790?" 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=790.
To find the number halfway between 87 and 790, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 790 into our formula, we get:
(87 + 790)/2 = 438.5
Thus, the number halfway between 87 and 790 is 438.5.
To check that our answer is correct, we subtract 87 from 438.5 and subtract 438.5 from 790 and compare the two numbers:
438.5 - 87 = 351.5
790 - 438.5 = 351.5
As you can see, the halfway number is 351.5 higher than 87 and 351.5 lower than 790. Therefore, our halfway between answer of 438.5 above is correct.
Halfway Between
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Halfway Between 87 and 791
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