When you ask "What number is halfway between 31 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=31 and Y=198.
To find the number halfway between 31 and 198, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 198 into our formula, we get:
(31 + 198)/2 = 114.5
Thus, the number halfway between 31 and 198 is 114.5.
To check that our answer is correct, we subtract 31 from 114.5 and subtract 114.5 from 198 and compare the two numbers:
114.5 - 31 = 83.5
198 - 114.5 = 83.5
As you can see, the halfway number is 83.5 higher than 31 and 83.5 lower than 198. Therefore, our halfway between answer of 114.5 above is correct.
Halfway Between
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Halfway Between 31 and 199
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