When you ask "What number is halfway between 84 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=84 and Y=221.
To find the number halfway between 84 and 221, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 221 into our formula, we get:
(84 + 221)/2 = 152.5
Thus, the number halfway between 84 and 221 is 152.5.
To check that our answer is correct, we subtract 84 from 152.5 and subtract 152.5 from 221 and compare the two numbers:
152.5 - 84 = 68.5
221 - 152.5 = 68.5
As you can see, the halfway number is 68.5 higher than 84 and 68.5 lower than 221. Therefore, our halfway between answer of 152.5 above is correct.
Halfway Between
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Halfway Between 84 and 222
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