When you ask "What number is halfway between 20 and 717?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=717.
To find the number halfway between 20 and 717, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 717 into our formula, we get:
(20 + 717)/2 = 368.5
Thus, the number halfway between 20 and 717 is 368.5.
To check that our answer is correct, we subtract 20 from 368.5 and subtract 368.5 from 717 and compare the two numbers:
368.5 - 20 = 348.5
717 - 368.5 = 348.5
As you can see, the halfway number is 348.5 higher than 20 and 348.5 lower than 717. Therefore, our halfway between answer of 368.5 above is correct.
Halfway Between
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Halfway Between 20 and 718
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