When you ask "What number is halfway between 100 and 178?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=178.
To find the number halfway between 100 and 178, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 178 into our formula, we get:
(100 + 178)/2 = 139
Thus, the number halfway between 100 and 178 is 139.
To check that our answer is correct, we subtract 100 from 139 and subtract 139 from 178 and compare the two numbers:
139 - 100 = 39
178 - 139 = 39
As you can see, the halfway number is 39 higher than 100 and 39 lower than 178. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 100 and 179
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