When you ask "What number is halfway between 21 and 283?" 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=283.
To find the number halfway between 21 and 283, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 283 into our formula, we get:
(21 + 283)/2 = 152
Thus, the number halfway between 21 and 283 is 152.
To check that our answer is correct, we subtract 21 from 152 and subtract 152 from 283 and compare the two numbers:
152 - 21 = 131
283 - 152 = 131
As you can see, the halfway number is 131 higher than 21 and 131 lower than 283. Therefore, our halfway between answer of 152 above is correct.
Halfway Between
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Halfway Between 21 and 284
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