When you ask "What number is halfway between 77 and 221?" 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=221.
To find the number halfway between 77 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 221 into our formula, we get:
(77 + 221)/2 = 149
Thus, the number halfway between 77 and 221 is 149.
To check that our answer is correct, we subtract 77 from 149 and subtract 149 from 221 and compare the two numbers:
149 - 77 = 72
221 - 149 = 72
As you can see, the halfway number is 72 higher than 77 and 72 lower than 221. Therefore, our halfway between answer of 149 above is correct.
Halfway Between
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Halfway Between 77 and 222
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