When you ask "What number is halfway between 20 and 357?" 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=357.
To find the number halfway between 20 and 357, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 357 into our formula, we get:
(20 + 357)/2 = 188.5
Thus, the number halfway between 20 and 357 is 188.5.
To check that our answer is correct, we subtract 20 from 188.5 and subtract 188.5 from 357 and compare the two numbers:
188.5 - 20 = 168.5
357 - 188.5 = 168.5
As you can see, the halfway number is 168.5 higher than 20 and 168.5 lower than 357. Therefore, our halfway between answer of 188.5 above is correct.
Halfway Between
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Halfway Between 20 and 358
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