When you ask "What number is halfway between 21 and 674?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=674.
To find the number halfway between 21 and 674, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 674 into our formula, we get:
(21 + 674)/2 = 347.5
Thus, the number halfway between 21 and 674 is 347.5.
To check that our answer is correct, we subtract 21 from 347.5 and subtract 347.5 from 674 and compare the two numbers:
347.5 - 21 = 326.5
674 - 347.5 = 326.5
As you can see, the halfway number is 326.5 higher than 21 and 326.5 lower than 674. Therefore, our halfway between answer of 347.5 above is correct.
Halfway Between
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Halfway Between 21 and 675
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