When you ask "What number is halfway between 21 and 611?" 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=611.
To find the number halfway between 21 and 611, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 611 into our formula, we get:
(21 + 611)/2 = 316
Thus, the number halfway between 21 and 611 is 316.
To check that our answer is correct, we subtract 21 from 316 and subtract 316 from 611 and compare the two numbers:
316 - 21 = 295
611 - 316 = 295
As you can see, the halfway number is 295 higher than 21 and 295 lower than 611. Therefore, our halfway between answer of 316 above is correct.
Halfway Between
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Halfway Between 21 and 612
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