When you ask "What number is halfway between 21 and 402?" 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=402.
To find the number halfway between 21 and 402, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 402 into our formula, we get:
(21 + 402)/2 = 211.5
Thus, the number halfway between 21 and 402 is 211.5.
To check that our answer is correct, we subtract 21 from 211.5 and subtract 211.5 from 402 and compare the two numbers:
211.5 - 21 = 190.5
402 - 211.5 = 190.5
As you can see, the halfway number is 190.5 higher than 21 and 190.5 lower than 402. Therefore, our halfway between answer of 211.5 above is correct.
Halfway Between
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Halfway Between 21 and 403
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