When you ask "What number is halfway between 21 and 672?" 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=672.
To find the number halfway between 21 and 672, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 672 into our formula, we get:
(21 + 672)/2 = 346.5
Thus, the number halfway between 21 and 672 is 346.5.
To check that our answer is correct, we subtract 21 from 346.5 and subtract 346.5 from 672 and compare the two numbers:
346.5 - 21 = 325.5
672 - 346.5 = 325.5
As you can see, the halfway number is 325.5 higher than 21 and 325.5 lower than 672. Therefore, our halfway between answer of 346.5 above is correct.
Halfway Between
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Halfway Between 21 and 673
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