When you ask "What number is halfway between 21 and 303?" 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=303.
To find the number halfway between 21 and 303, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 303 into our formula, we get:
(21 + 303)/2 = 162
Thus, the number halfway between 21 and 303 is 162.
To check that our answer is correct, we subtract 21 from 162 and subtract 162 from 303 and compare the two numbers:
162 - 21 = 141
303 - 162 = 141
As you can see, the halfway number is 141 higher than 21 and 141 lower than 303. Therefore, our halfway between answer of 162 above is correct.
Halfway Between
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Halfway Between 21 and 304
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