When you ask "What number is halfway between 7 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=7 and Y=117.
To find the number halfway between 7 and 117, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 117 into our formula, we get:
(7 + 117)/2 = 62
Thus, the number halfway between 7 and 117 is 62.
To check that our answer is correct, we subtract 7 from 62 and subtract 62 from 117 and compare the two numbers:
62 - 7 = 55
117 - 62 = 55
As you can see, the halfway number is 55 higher than 7 and 55 lower than 117. Therefore, our halfway between answer of 62 above is correct.
Halfway Between
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Halfway Between 7 and 118
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