When you ask "What number is halfway between 73 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=73 and Y=645.
To find the number halfway between 73 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 73 and 645 into our formula, we get:
(73 + 645)/2 = 359
Thus, the number halfway between 73 and 645 is 359.
To check that our answer is correct, we subtract 73 from 359 and subtract 359 from 645 and compare the two numbers:
359 - 73 = 286
645 - 359 = 286
As you can see, the halfway number is 286 higher than 73 and 286 lower than 645. Therefore, our halfway between answer of 359 above is correct.
Halfway Between
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Halfway Between 73 and 646
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