When you ask "What number is halfway between 64 and 321?" 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=321.
To find the number halfway between 64 and 321, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 321 into our formula, we get:
(64 + 321)/2 = 192.5
Thus, the number halfway between 64 and 321 is 192.5.
To check that our answer is correct, we subtract 64 from 192.5 and subtract 192.5 from 321 and compare the two numbers:
192.5 - 64 = 128.5
321 - 192.5 = 128.5
As you can see, the halfway number is 128.5 higher than 64 and 128.5 lower than 321. Therefore, our halfway between answer of 192.5 above is correct.
Halfway Between
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Halfway Between 64 and 322
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