When you ask "What number is halfway between 7 and 218?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=218.
To find the number halfway between 7 and 218, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 218 into our formula, we get:
(7 + 218)/2 = 112.5
Thus, the number halfway between 7 and 218 is 112.5.
To check that our answer is correct, we subtract 7 from 112.5 and subtract 112.5 from 218 and compare the two numbers:
112.5 - 7 = 105.5
218 - 112.5 = 105.5
As you can see, the halfway number is 105.5 higher than 7 and 105.5 lower than 218. Therefore, our halfway between answer of 112.5 above is correct.
Halfway Between
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Halfway Between 7 and 219
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