When you ask "What number is halfway between 99 and 278?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=99 and Y=278.
To find the number halfway between 99 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 278 into our formula, we get:
(99 + 278)/2 = 188.5
Thus, the number halfway between 99 and 278 is 188.5.
To check that our answer is correct, we subtract 99 from 188.5 and subtract 188.5 from 278 and compare the two numbers:
188.5 - 99 = 89.5
278 - 188.5 = 89.5
As you can see, the halfway number is 89.5 higher than 99 and 89.5 lower than 278. Therefore, our halfway between answer of 188.5 above is correct.
Halfway Between
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Halfway Between 99 and 279
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