When you ask "What number is halfway between 20 and 118?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=118.
To find the number halfway between 20 and 118, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 118 into our formula, we get:
(20 + 118)/2 = 69
Thus, the number halfway between 20 and 118 is 69.
To check that our answer is correct, we subtract 20 from 69 and subtract 69 from 118 and compare the two numbers:
69 - 20 = 49
118 - 69 = 49
As you can see, the halfway number is 49 higher than 20 and 49 lower than 118. Therefore, our halfway between answer of 69 above is correct.
Halfway Between
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Halfway Between 20 and 119
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