When you ask "What number is halfway between 29 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=29 and Y=840.
To find the number halfway between 29 and 840, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 29 and 840 into our formula, we get:
(29 + 840)/2 = 434.5
Thus, the number halfway between 29 and 840 is 434.5.
To check that our answer is correct, we subtract 29 from 434.5 and subtract 434.5 from 840 and compare the two numbers:
434.5 - 29 = 405.5
840 - 434.5 = 405.5
As you can see, the halfway number is 405.5 higher than 29 and 405.5 lower than 840. Therefore, our halfway between answer of 434.5 above is correct.
Halfway Between
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Halfway Between 29 and 841
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