When you ask "What number is halfway between 100 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=100 and Y=243.
To find the number halfway between 100 and 243, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 243 into our formula, we get:
(100 + 243)/2 = 171.5
Thus, the number halfway between 100 and 243 is 171.5.
To check that our answer is correct, we subtract 100 from 171.5 and subtract 171.5 from 243 and compare the two numbers:
171.5 - 100 = 71.5
243 - 171.5 = 71.5
As you can see, the halfway number is 71.5 higher than 100 and 71.5 lower than 243. Therefore, our halfway between answer of 171.5 above is correct.
Halfway Between
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Halfway Between 100 and 244
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