When you ask "What number is halfway between 64 and 221?" 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=221.
To find the number halfway between 64 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 64 and 221 into our formula, we get:
(64 + 221)/2 = 142.5
Thus, the number halfway between 64 and 221 is 142.5.
To check that our answer is correct, we subtract 64 from 142.5 and subtract 142.5 from 221 and compare the two numbers:
142.5 - 64 = 78.5
221 - 142.5 = 78.5
As you can see, the halfway number is 78.5 higher than 64 and 78.5 lower than 221. Therefore, our halfway between answer of 142.5 above is correct.
Halfway Between
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Halfway Between 64 and 222
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