When you ask "What number is halfway between 84 and 840?" 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=840.
To find the number halfway between 84 and 840, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 840 into our formula, we get:
(84 + 840)/2 = 462
Thus, the number halfway between 84 and 840 is 462.
To check that our answer is correct, we subtract 84 from 462 and subtract 462 from 840 and compare the two numbers:
462 - 84 = 378
840 - 462 = 378
As you can see, the halfway number is 378 higher than 84 and 378 lower than 840. Therefore, our halfway between answer of 462 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 84 and 841
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