When you ask "What number is halfway between 99 and 399?" 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=399.
To find the number halfway between 99 and 399, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 399 into our formula, we get:
(99 + 399)/2 = 249
Thus, the number halfway between 99 and 399 is 249.
To check that our answer is correct, we subtract 99 from 249 and subtract 249 from 399 and compare the two numbers:
249 - 99 = 150
399 - 249 = 150
As you can see, the halfway number is 150 higher than 99 and 150 lower than 399. Therefore, our halfway between answer of 249 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 99 and 400
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