When you ask "What number is halfway between 100 and 615?" 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=615.
To find the number halfway between 100 and 615, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 615 into our formula, we get:
(100 + 615)/2 = 357.5
Thus, the number halfway between 100 and 615 is 357.5.
To check that our answer is correct, we subtract 100 from 357.5 and subtract 357.5 from 615 and compare the two numbers:
357.5 - 100 = 257.5
615 - 357.5 = 257.5
As you can see, the halfway number is 257.5 higher than 100 and 257.5 lower than 615. Therefore, our halfway between answer of 357.5 above is correct.
Halfway Between
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Halfway Between 100 and 616
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