When you ask "What number is halfway between 84 and 390?" 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=390.
To find the number halfway between 84 and 390, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 390 into our formula, we get:
(84 + 390)/2 = 237
Thus, the number halfway between 84 and 390 is 237.
To check that our answer is correct, we subtract 84 from 237 and subtract 237 from 390 and compare the two numbers:
237 - 84 = 153
390 - 237 = 153
As you can see, the halfway number is 153 higher than 84 and 153 lower than 390. Therefore, our halfway between answer of 237 above is correct.
Halfway Between
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Halfway Between 84 and 391
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