When you ask "What number is halfway between 87 and 254?" 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=254.
To find the number halfway between 87 and 254, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 254 into our formula, we get:
(87 + 254)/2 = 170.5
Thus, the number halfway between 87 and 254 is 170.5.
To check that our answer is correct, we subtract 87 from 170.5 and subtract 170.5 from 254 and compare the two numbers:
170.5 - 87 = 83.5
254 - 170.5 = 83.5
As you can see, the halfway number is 83.5 higher than 87 and 83.5 lower than 254. Therefore, our halfway between answer of 170.5 above is correct.
Halfway Between
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Halfway Between 87 and 255
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