When you ask "What number is halfway between 21 and 217?" 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=217.
To find the number halfway between 21 and 217, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 217 into our formula, we get:
(21 + 217)/2 = 119
Thus, the number halfway between 21 and 217 is 119.
To check that our answer is correct, we subtract 21 from 119 and subtract 119 from 217 and compare the two numbers:
119 - 21 = 98
217 - 119 = 98
As you can see, the halfway number is 98 higher than 21 and 98 lower than 217. Therefore, our halfway between answer of 119 above is correct.
Halfway Between
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Halfway Between 21 and 218
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