When you ask "What number is halfway between 7 and 645?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=645.
To find the number halfway between 7 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 645 into our formula, we get:
(7 + 645)/2 = 326
Thus, the number halfway between 7 and 645 is 326.
To check that our answer is correct, we subtract 7 from 326 and subtract 326 from 645 and compare the two numbers:
326 - 7 = 319
645 - 326 = 319
As you can see, the halfway number is 319 higher than 7 and 319 lower than 645. Therefore, our halfway between answer of 326 above is correct.
Halfway Between
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Halfway Between 7 and 646
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