When you ask "What number is halfway between 99 and 177?" 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=177.
To find the number halfway between 99 and 177, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 177 into our formula, we get:
(99 + 177)/2 = 138
Thus, the number halfway between 99 and 177 is 138.
To check that our answer is correct, we subtract 99 from 138 and subtract 138 from 177 and compare the two numbers:
138 - 99 = 39
177 - 138 = 39
As you can see, the halfway number is 39 higher than 99 and 39 lower than 177. Therefore, our halfway between answer of 138 above is correct.
Halfway Between
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Halfway Between 99 and 178
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