When you ask "What number is halfway between 21 and 247?" 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=247.
To find the number halfway between 21 and 247, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 247 into our formula, we get:
(21 + 247)/2 = 134
Thus, the number halfway between 21 and 247 is 134.
To check that our answer is correct, we subtract 21 from 134 and subtract 134 from 247 and compare the two numbers:
134 - 21 = 113
247 - 134 = 113
As you can see, the halfway number is 113 higher than 21 and 113 lower than 247. Therefore, our halfway between answer of 134 above is correct.
Halfway Between
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Halfway Between 21 and 248
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