When you ask "What number is halfway between 100 and 207?" 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=207.
To find the number halfway between 100 and 207, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 207 into our formula, we get:
(100 + 207)/2 = 153.5
Thus, the number halfway between 100 and 207 is 153.5.
To check that our answer is correct, we subtract 100 from 153.5 and subtract 153.5 from 207 and compare the two numbers:
153.5 - 100 = 53.5
207 - 153.5 = 53.5
As you can see, the halfway number is 53.5 higher than 100 and 53.5 lower than 207. Therefore, our halfway between answer of 153.5 above is correct.
Halfway Between
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Halfway Between 100 and 208
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