When you ask "What number is halfway between 21 and 335?" 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=335.
To find the number halfway between 21 and 335, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 335 into our formula, we get:
(21 + 335)/2 = 178
Thus, the number halfway between 21 and 335 is 178.
To check that our answer is correct, we subtract 21 from 178 and subtract 178 from 335 and compare the two numbers:
178 - 21 = 157
335 - 178 = 157
As you can see, the halfway number is 157 higher than 21 and 157 lower than 335. Therefore, our halfway between answer of 178 above is correct.
Halfway Between
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Halfway Between 21 and 336
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