When you ask "What number is halfway between 84 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=84 and Y=243.
To find the number halfway between 84 and 243, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 243 into our formula, we get:
(84 + 243)/2 = 163.5
Thus, the number halfway between 84 and 243 is 163.5.
To check that our answer is correct, we subtract 84 from 163.5 and subtract 163.5 from 243 and compare the two numbers:
163.5 - 84 = 79.5
243 - 163.5 = 79.5
As you can see, the halfway number is 79.5 higher than 84 and 79.5 lower than 243. Therefore, our halfway between answer of 163.5 above is correct.
Halfway Between
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Halfway Between 84 and 244
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