When you ask "What number is halfway between 29 and 820?" 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=820.
To find the number halfway between 29 and 820, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 29 and 820 into our formula, we get:
(29 + 820)/2 = 424.5
Thus, the number halfway between 29 and 820 is 424.5.
To check that our answer is correct, we subtract 29 from 424.5 and subtract 424.5 from 820 and compare the two numbers:
424.5 - 29 = 395.5
820 - 424.5 = 395.5
As you can see, the halfway number is 395.5 higher than 29 and 395.5 lower than 820. Therefore, our halfway between answer of 424.5 above is correct.
Halfway Between
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