When you ask "What number is halfway between 100 and 155?" 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=155.
To find the number halfway between 100 and 155, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 155 into our formula, we get:
(100 + 155)/2 = 127.5
Thus, the number halfway between 100 and 155 is 127.5.
To check that our answer is correct, we subtract 100 from 127.5 and subtract 127.5 from 155 and compare the two numbers:
127.5 - 100 = 27.5
155 - 127.5 = 27.5
As you can see, the halfway number is 27.5 higher than 100 and 27.5 lower than 155. Therefore, our halfway between answer of 127.5 above is correct.
Halfway Between
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Halfway Between 100 and 156
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