When you ask "What number is halfway between 78 and 200?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=78 and Y=200.
To find the number halfway between 78 and 200, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 200 into our formula, we get:
(78 + 200)/2 = 139
Thus, the number halfway between 78 and 200 is 139.
To check that our answer is correct, we subtract 78 from 139 and subtract 139 from 200 and compare the two numbers:
139 - 78 = 61
200 - 139 = 61
As you can see, the halfway number is 61 higher than 78 and 61 lower than 200. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 78 and 201
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