When you ask "What number is halfway between 9 and 98?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=98.
To find the number halfway between 9 and 98, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 98 into our formula, we get:
(9 + 98)/2 = 53.5
Thus, the number halfway between 9 and 98 is 53.5.
To check that our answer is correct, we subtract 9 from 53.5 and subtract 53.5 from 98 and compare the two numbers:
53.5 - 9 = 44.5
98 - 53.5 = 44.5
As you can see, the halfway number is 44.5 higher than 9 and 44.5 lower than 98. Therefore, our halfway between answer of 53.5 above is correct.
Halfway Between
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Halfway Between 9 and 99
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