When you ask "What number is halfway between 68 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=68 and Y=640.
To find the number halfway between 68 and 640, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 640 into our formula, we get:
(68 + 640)/2 = 354
Thus, the number halfway between 68 and 640 is 354.
To check that our answer is correct, we subtract 68 from 354 and subtract 354 from 640 and compare the two numbers:
354 - 68 = 286
640 - 354 = 286
As you can see, the halfway number is 286 higher than 68 and 286 lower than 640. Therefore, our halfway between answer of 354 above is correct.
Halfway Between
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