When you ask "What number is halfway between 20 and 649?" 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=649.
To find the number halfway between 20 and 649, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 649 into our formula, we get:
(20 + 649)/2 = 334.5
Thus, the number halfway between 20 and 649 is 334.5.
To check that our answer is correct, we subtract 20 from 334.5 and subtract 334.5 from 649 and compare the two numbers:
334.5 - 20 = 314.5
649 - 334.5 = 314.5
As you can see, the halfway number is 314.5 higher than 20 and 314.5 lower than 649. Therefore, our halfway between answer of 334.5 above is correct.
Halfway Between
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Halfway Between 20 and 650
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