When you ask "What number is halfway between 98 and 121?" 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=121.
To find the number halfway between 98 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 98 and 121 into our formula, we get:
(98 + 121)/2 = 109.5
Thus, the number halfway between 98 and 121 is 109.5.
To check that our answer is correct, we subtract 98 from 109.5 and subtract 109.5 from 121 and compare the two numbers:
109.5 - 98 = 11.5
121 - 109.5 = 11.5
As you can see, the halfway number is 11.5 higher than 98 and 11.5 lower than 121. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 98 and 122
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