When you ask "What number is halfway between 67 and 678?" 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=678.
To find the number halfway between 67 and 678, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 67 and 678 into our formula, we get:
(67 + 678)/2 = 372.5
Thus, the number halfway between 67 and 678 is 372.5.
To check that our answer is correct, we subtract 67 from 372.5 and subtract 372.5 from 678 and compare the two numbers:
372.5 - 67 = 305.5
678 - 372.5 = 305.5
As you can see, the halfway number is 305.5 higher than 67 and 305.5 lower than 678. Therefore, our halfway between answer of 372.5 above is correct.
Halfway Between
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Halfway Between 67 and 679
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