When you ask "What number is halfway between 21 and 342?" 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=342.
To find the number halfway between 21 and 342, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 342 into our formula, we get:
(21 + 342)/2 = 181.5
Thus, the number halfway between 21 and 342 is 181.5.
To check that our answer is correct, we subtract 21 from 181.5 and subtract 181.5 from 342 and compare the two numbers:
181.5 - 21 = 160.5
342 - 181.5 = 160.5
As you can see, the halfway number is 160.5 higher than 21 and 160.5 lower than 342. Therefore, our halfway between answer of 181.5 above is correct.
Halfway Between
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Halfway Between 21 and 343
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