When you ask "What number is halfway between 100 and 156?" 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=156.
To find the number halfway between 100 and 156, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 156 into our formula, we get:
(100 + 156)/2 = 128
Thus, the number halfway between 100 and 156 is 128.
To check that our answer is correct, we subtract 100 from 128 and subtract 128 from 156 and compare the two numbers:
128 - 100 = 28
156 - 128 = 28
As you can see, the halfway number is 28 higher than 100 and 28 lower than 156. Therefore, our halfway between answer of 128 above is correct.
Halfway Between
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Halfway Between 100 and 157
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