When you ask "What number is halfway between 67 and 178?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=67 and Y=178.
To find the number halfway between 67 and 178, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 67 and 178 into our formula, we get:
(67 + 178)/2 = 122.5
Thus, the number halfway between 67 and 178 is 122.5.
To check that our answer is correct, we subtract 67 from 122.5 and subtract 122.5 from 178 and compare the two numbers:
122.5 - 67 = 55.5
178 - 122.5 = 55.5
As you can see, the halfway number is 55.5 higher than 67 and 55.5 lower than 178. Therefore, our halfway between answer of 122.5 above is correct.
Halfway Between
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Halfway Between 67 and 179
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