When you ask "What number is halfway between 98 and 129?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=98 and Y=129.
To find the number halfway between 98 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 98 and 129 into our formula, we get:
(98 + 129)/2 = 113.5
Thus, the number halfway between 98 and 129 is 113.5.
To check that our answer is correct, we subtract 98 from 113.5 and subtract 113.5 from 129 and compare the two numbers:
113.5 - 98 = 15.5
129 - 113.5 = 15.5
As you can see, the halfway number is 15.5 higher than 98 and 15.5 lower than 129. Therefore, our halfway between answer of 113.5 above is correct.
Halfway Between
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Halfway Between 98 and 130
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