When you ask "What number is halfway between 10 and 640?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=640.
To find the number halfway between 10 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 640 into our formula, we get:
(10 + 640)/2 = 325
Thus, the number halfway between 10 and 640 is 325.
To check that our answer is correct, we subtract 10 from 325 and subtract 325 from 640 and compare the two numbers:
325 - 10 = 315
640 - 325 = 315
As you can see, the halfway number is 315 higher than 10 and 315 lower than 640. Therefore, our halfway between answer of 325 above is correct.
Halfway Between
Find halfway between two other numbers here!
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