When you ask "What number is halfway between 42 and 117?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=117.
To find the number halfway between 42 and 117, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 117 into our formula, we get:
(42 + 117)/2 = 79.5
Thus, the number halfway between 42 and 117 is 79.5.
To check that our answer is correct, we subtract 42 from 79.5 and subtract 79.5 from 117 and compare the two numbers:
79.5 - 42 = 37.5
117 - 79.5 = 37.5
As you can see, the halfway number is 37.5 higher than 42 and 37.5 lower than 117. Therefore, our halfway between answer of 79.5 above is correct.
Halfway Between
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Halfway Between 42 and 118
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