When you ask "What number is halfway between 64 and 215?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=64 and Y=215.
To find the number halfway between 64 and 215, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 215 into our formula, we get:
(64 + 215)/2 = 139.5
Thus, the number halfway between 64 and 215 is 139.5.
To check that our answer is correct, we subtract 64 from 139.5 and subtract 139.5 from 215 and compare the two numbers:
139.5 - 64 = 75.5
215 - 139.5 = 75.5
As you can see, the halfway number is 75.5 higher than 64 and 75.5 lower than 215. Therefore, our halfway between answer of 139.5 above is correct.
Halfway Between
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