When you ask "What number is halfway between 87 and 358?" 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=358.
To find the number halfway between 87 and 358, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 358 into our formula, we get:
(87 + 358)/2 = 222.5
Thus, the number halfway between 87 and 358 is 222.5.
To check that our answer is correct, we subtract 87 from 222.5 and subtract 222.5 from 358 and compare the two numbers:
222.5 - 87 = 135.5
358 - 222.5 = 135.5
As you can see, the halfway number is 135.5 higher than 87 and 135.5 lower than 358. Therefore, our halfway between answer of 222.5 above is correct.
Halfway Between
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Halfway Between 87 and 359
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