When you ask "What number is halfway between 100 and 777?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=777.
To find the number halfway between 100 and 777, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 777 into our formula, we get:
(100 + 777)/2 = 438.5
Thus, the number halfway between 100 and 777 is 438.5.
To check that our answer is correct, we subtract 100 from 438.5 and subtract 438.5 from 777 and compare the two numbers:
438.5 - 100 = 338.5
777 - 438.5 = 338.5
As you can see, the halfway number is 338.5 higher than 100 and 338.5 lower than 777. Therefore, our halfway between answer of 438.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 100 and 778
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