When you ask "What number is halfway between 64 and 99?" 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=99.
To find the number halfway between 64 and 99, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 99 into our formula, we get:
(64 + 99)/2 = 81.5
Thus, the number halfway between 64 and 99 is 81.5.
To check that our answer is correct, we subtract 64 from 81.5 and subtract 81.5 from 99 and compare the two numbers:
81.5 - 64 = 17.5
99 - 81.5 = 17.5
As you can see, the halfway number is 17.5 higher than 64 and 17.5 lower than 99. Therefore, our halfway between answer of 81.5 above is correct.
Halfway Between
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Halfway Between 64 and 100
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