When you ask "What number is halfway between 21 and 343?" 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=343.
To find the number halfway between 21 and 343, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 343 into our formula, we get:
(21 + 343)/2 = 182
Thus, the number halfway between 21 and 343 is 182.
To check that our answer is correct, we subtract 21 from 182 and subtract 182 from 343 and compare the two numbers:
182 - 21 = 161
343 - 182 = 161
As you can see, the halfway number is 161 higher than 21 and 161 lower than 343. Therefore, our halfway between answer of 182 above is correct.
Halfway Between
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Halfway Between 21 and 344
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