When you ask "What number is halfway between 100 and 649?" 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=649.
To find the number halfway between 100 and 649, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 649 into our formula, we get:
(100 + 649)/2 = 374.5
Thus, the number halfway between 100 and 649 is 374.5.
To check that our answer is correct, we subtract 100 from 374.5 and subtract 374.5 from 649 and compare the two numbers:
374.5 - 100 = 274.5
649 - 374.5 = 274.5
As you can see, the halfway number is 274.5 higher than 100 and 274.5 lower than 649. Therefore, our halfway between answer of 374.5 above is correct.
Halfway Between
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Halfway Between 100 and 650
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