When you ask "What number is halfway between 21 and 544?" 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=544.
To find the number halfway between 21 and 544, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 544 into our formula, we get:
(21 + 544)/2 = 282.5
Thus, the number halfway between 21 and 544 is 282.5.
To check that our answer is correct, we subtract 21 from 282.5 and subtract 282.5 from 544 and compare the two numbers:
282.5 - 21 = 261.5
544 - 282.5 = 261.5
As you can see, the halfway number is 261.5 higher than 21 and 261.5 lower than 544. Therefore, our halfway between answer of 282.5 above is correct.
Halfway Between
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Halfway Between 21 and 545
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