When you ask "What number is halfway between 21 and 743?" 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=743.
To find the number halfway between 21 and 743, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 743 into our formula, we get:
(21 + 743)/2 = 382
Thus, the number halfway between 21 and 743 is 382.
To check that our answer is correct, we subtract 21 from 382 and subtract 382 from 743 and compare the two numbers:
382 - 21 = 361
743 - 382 = 361
As you can see, the halfway number is 361 higher than 21 and 361 lower than 743. Therefore, our halfway between answer of 382 above is correct.
Halfway Between
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Halfway Between 21 and 744
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