When you ask "What number is halfway between 84 and 661?" 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=661.
To find the number halfway between 84 and 661, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 661 into our formula, we get:
(84 + 661)/2 = 372.5
Thus, the number halfway between 84 and 661 is 372.5.
To check that our answer is correct, we subtract 84 from 372.5 and subtract 372.5 from 661 and compare the two numbers:
372.5 - 84 = 288.5
661 - 372.5 = 288.5
As you can see, the halfway number is 288.5 higher than 84 and 288.5 lower than 661. Therefore, our halfway between answer of 372.5 above is correct.
Halfway Between
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Halfway Between 84 and 662
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