When you ask "What number is halfway between 7 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=7 and Y=840.
To find the number halfway between 7 and 840, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 840 into our formula, we get:
(7 + 840)/2 = 423.5
Thus, the number halfway between 7 and 840 is 423.5.
To check that our answer is correct, we subtract 7 from 423.5 and subtract 423.5 from 840 and compare the two numbers:
423.5 - 7 = 416.5
840 - 423.5 = 416.5
As you can see, the halfway number is 416.5 higher than 7 and 416.5 lower than 840. Therefore, our halfway between answer of 423.5 above is correct.
Halfway Between
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Halfway Between 7 and 841
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