When you ask "What number is halfway between 87 and 320?" 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=320.
To find the number halfway between 87 and 320, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 320 into our formula, we get:
(87 + 320)/2 = 203.5
Thus, the number halfway between 87 and 320 is 203.5.
To check that our answer is correct, we subtract 87 from 203.5 and subtract 203.5 from 320 and compare the two numbers:
203.5 - 87 = 116.5
320 - 203.5 = 116.5
As you can see, the halfway number is 116.5 higher than 87 and 116.5 lower than 320. Therefore, our halfway between answer of 203.5 above is correct.
Halfway Between
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Halfway Between 87 and 321
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