When you ask "What number is halfway between 21 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=21 and Y=98.
To find the number halfway between 21 and 98, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 98 into our formula, we get:
(21 + 98)/2 = 59.5
Thus, the number halfway between 21 and 98 is 59.5.
To check that our answer is correct, we subtract 21 from 59.5 and subtract 59.5 from 98 and compare the two numbers:
59.5 - 21 = 38.5
98 - 59.5 = 38.5
As you can see, the halfway number is 38.5 higher than 21 and 38.5 lower than 98. Therefore, our halfway between answer of 59.5 above is correct.
Halfway Between
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Halfway Between 21 and 99
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