When you ask "What number is halfway between 21 and 670?" 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=670.
To find the number halfway between 21 and 670, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 670 into our formula, we get:
(21 + 670)/2 = 345.5
Thus, the number halfway between 21 and 670 is 345.5.
To check that our answer is correct, we subtract 21 from 345.5 and subtract 345.5 from 670 and compare the two numbers:
345.5 - 21 = 324.5
670 - 345.5 = 324.5
As you can see, the halfway number is 324.5 higher than 21 and 324.5 lower than 670. Therefore, our halfway between answer of 345.5 above is correct.
Halfway Between
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Halfway Between 21 and 671
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