When you ask "What number is halfway between 99 and 428?" 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=428.
To find the number halfway between 99 and 428, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 428 into our formula, we get:
(99 + 428)/2 = 263.5
Thus, the number halfway between 99 and 428 is 263.5.
To check that our answer is correct, we subtract 99 from 263.5 and subtract 263.5 from 428 and compare the two numbers:
263.5 - 99 = 164.5
428 - 263.5 = 164.5
As you can see, the halfway number is 164.5 higher than 99 and 164.5 lower than 428. Therefore, our halfway between answer of 263.5 above is correct.
Halfway Between
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Halfway Between 99 and 429
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