When you ask "What number is halfway between 21 and 754?" 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=754.
To find the number halfway between 21 and 754, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 754 into our formula, we get:
(21 + 754)/2 = 387.5
Thus, the number halfway between 21 and 754 is 387.5.
To check that our answer is correct, we subtract 21 from 387.5 and subtract 387.5 from 754 and compare the two numbers:
387.5 - 21 = 366.5
754 - 387.5 = 366.5
As you can see, the halfway number is 366.5 higher than 21 and 366.5 lower than 754. Therefore, our halfway between answer of 387.5 above is correct.
Halfway Between
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Halfway Between 21 and 755
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