When you ask "What number is halfway between 100 and 659?" 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=659.
To find the number halfway between 100 and 659, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 659 into our formula, we get:
(100 + 659)/2 = 379.5
Thus, the number halfway between 100 and 659 is 379.5.
To check that our answer is correct, we subtract 100 from 379.5 and subtract 379.5 from 659 and compare the two numbers:
379.5 - 100 = 279.5
659 - 379.5 = 279.5
As you can see, the halfway number is 279.5 higher than 100 and 279.5 lower than 659. Therefore, our halfway between answer of 379.5 above is correct.
Halfway Between
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Halfway Between 100 and 660
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