When you ask "What number is halfway between 99 and 159?" 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=159.
To find the number halfway between 99 and 159, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 159 into our formula, we get:
(99 + 159)/2 = 129
Thus, the number halfway between 99 and 159 is 129.
To check that our answer is correct, we subtract 99 from 129 and subtract 129 from 159 and compare the two numbers:
129 - 99 = 30
159 - 129 = 30
As you can see, the halfway number is 30 higher than 99 and 30 lower than 159. Therefore, our halfway between answer of 129 above is correct.
Halfway Between
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Halfway Between 99 and 160
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