When you ask "What number is halfway between 77 and 201?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=77 and Y=201.
To find the number halfway between 77 and 201, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 201 into our formula, we get:
(77 + 201)/2 = 139
Thus, the number halfway between 77 and 201 is 139.
To check that our answer is correct, we subtract 77 from 139 and subtract 139 from 201 and compare the two numbers:
139 - 77 = 62
201 - 139 = 62
As you can see, the halfway number is 62 higher than 77 and 62 lower than 201. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 77 and 202
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