When you ask "What number is halfway between 21 and 350?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=350.
To find the number halfway between 21 and 350, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 350 into our formula, we get:
(21 + 350)/2 = 185.5
Thus, the number halfway between 21 and 350 is 185.5.
To check that our answer is correct, we subtract 21 from 185.5 and subtract 185.5 from 350 and compare the two numbers:
185.5 - 21 = 164.5
350 - 185.5 = 164.5
As you can see, the halfway number is 164.5 higher than 21 and 164.5 lower than 350. Therefore, our halfway between answer of 185.5 above is correct.
Halfway Between
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Halfway Between 21 and 351
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