When you ask "What number is halfway between 64 and 399?" 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=399.
To find the number halfway between 64 and 399, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 399 into our formula, we get:
(64 + 399)/2 = 231.5
Thus, the number halfway between 64 and 399 is 231.5.
To check that our answer is correct, we subtract 64 from 231.5 and subtract 231.5 from 399 and compare the two numbers:
231.5 - 64 = 167.5
399 - 231.5 = 167.5
As you can see, the halfway number is 167.5 higher than 64 and 167.5 lower than 399. Therefore, our halfway between answer of 231.5 above is correct.
Halfway Between
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Halfway Between 64 and 400
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