When you ask "What number is halfway between 17 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=17 and Y=840.
To find the number halfway between 17 and 840, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 840 into our formula, we get:
(17 + 840)/2 = 428.5
Thus, the number halfway between 17 and 840 is 428.5.
To check that our answer is correct, we subtract 17 from 428.5 and subtract 428.5 from 840 and compare the two numbers:
428.5 - 17 = 411.5
840 - 428.5 = 411.5
As you can see, the halfway number is 411.5 higher than 17 and 411.5 lower than 840. Therefore, our halfway between answer of 428.5 above is correct.
Halfway Between
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Halfway Between 17 and 841
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