When you ask "What number is halfway between 21 and 347?" 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=347.
To find the number halfway between 21 and 347, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 347 into our formula, we get:
(21 + 347)/2 = 184
Thus, the number halfway between 21 and 347 is 184.
To check that our answer is correct, we subtract 21 from 184 and subtract 184 from 347 and compare the two numbers:
184 - 21 = 163
347 - 184 = 163
As you can see, the halfway number is 163 higher than 21 and 163 lower than 347. Therefore, our halfway between answer of 184 above is correct.
Halfway Between
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Halfway Between 21 and 348
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