When you ask "What number is halfway between 21 and 552?" 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=552.
To find the number halfway between 21 and 552, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 552 into our formula, we get:
(21 + 552)/2 = 286.5
Thus, the number halfway between 21 and 552 is 286.5.
To check that our answer is correct, we subtract 21 from 286.5 and subtract 286.5 from 552 and compare the two numbers:
286.5 - 21 = 265.5
552 - 286.5 = 265.5
As you can see, the halfway number is 265.5 higher than 21 and 265.5 lower than 552. Therefore, our halfway between answer of 286.5 above is correct.
Halfway Between
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Halfway Between 21 and 553
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