When you ask "What number is halfway between 100 and 635?" 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=635.
To find the number halfway between 100 and 635, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 635 into our formula, we get:
(100 + 635)/2 = 367.5
Thus, the number halfway between 100 and 635 is 367.5.
To check that our answer is correct, we subtract 100 from 367.5 and subtract 367.5 from 635 and compare the two numbers:
367.5 - 100 = 267.5
635 - 367.5 = 267.5
As you can see, the halfway number is 267.5 higher than 100 and 267.5 lower than 635. Therefore, our halfway between answer of 367.5 above is correct.
Halfway Between
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Halfway Between 100 and 636
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