When you ask "What number is halfway between 87 and 198?" 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=198.
To find the number halfway between 87 and 198, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 198 into our formula, we get:
(87 + 198)/2 = 142.5
Thus, the number halfway between 87 and 198 is 142.5.
To check that our answer is correct, we subtract 87 from 142.5 and subtract 142.5 from 198 and compare the two numbers:
142.5 - 87 = 55.5
198 - 142.5 = 55.5
As you can see, the halfway number is 55.5 higher than 87 and 55.5 lower than 198. Therefore, our halfway between answer of 142.5 above is correct.
Halfway Between
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Halfway Between 87 and 199
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