When you ask "What number is halfway between 81 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=81 and Y=198.
To find the number halfway between 81 and 198, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 198 into our formula, we get:
(81 + 198)/2 = 139.5
Thus, the number halfway between 81 and 198 is 139.5.
To check that our answer is correct, we subtract 81 from 139.5 and subtract 139.5 from 198 and compare the two numbers:
139.5 - 81 = 58.5
198 - 139.5 = 58.5
As you can see, the halfway number is 58.5 higher than 81 and 58.5 lower than 198. Therefore, our halfway between answer of 139.5 above is correct.
Halfway Between
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Halfway Between 81 and 199
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