When you ask "What number is halfway between 21 and 243?" 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=243.
To find the number halfway between 21 and 243, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 243 into our formula, we get:
(21 + 243)/2 = 132
Thus, the number halfway between 21 and 243 is 132.
To check that our answer is correct, we subtract 21 from 132 and subtract 132 from 243 and compare the two numbers:
132 - 21 = 111
243 - 132 = 111
As you can see, the halfway number is 111 higher than 21 and 111 lower than 243. Therefore, our halfway between answer of 132 above is correct.
Halfway Between
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Halfway Between 21 and 244
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