When you ask "What number is halfway between 21 and 336?" 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=336.
To find the number halfway between 21 and 336, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 336 into our formula, we get:
(21 + 336)/2 = 178.5
Thus, the number halfway between 21 and 336 is 178.5.
To check that our answer is correct, we subtract 21 from 178.5 and subtract 178.5 from 336 and compare the two numbers:
178.5 - 21 = 157.5
336 - 178.5 = 157.5
As you can see, the halfway number is 157.5 higher than 21 and 157.5 lower than 336. Therefore, our halfway between answer of 178.5 above is correct.
Halfway Between
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Halfway Between 21 and 337
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