When you ask "What number is halfway between 21 and 296?" 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=296.
To find the number halfway between 21 and 296, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 296 into our formula, we get:
(21 + 296)/2 = 158.5
Thus, the number halfway between 21 and 296 is 158.5.
To check that our answer is correct, we subtract 21 from 158.5 and subtract 158.5 from 296 and compare the two numbers:
158.5 - 21 = 137.5
296 - 158.5 = 137.5
As you can see, the halfway number is 137.5 higher than 21 and 137.5 lower than 296. Therefore, our halfway between answer of 158.5 above is correct.
Halfway Between
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Halfway Between 21 and 297
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