When you ask "What number is halfway between 21 and 198?" 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=198.
To find the number halfway between 21 and 198, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 198 into our formula, we get:
(21 + 198)/2 = 109.5
Thus, the number halfway between 21 and 198 is 109.5.
To check that our answer is correct, we subtract 21 from 109.5 and subtract 109.5 from 198 and compare the two numbers:
109.5 - 21 = 88.5
198 - 109.5 = 88.5
As you can see, the halfway number is 88.5 higher than 21 and 88.5 lower than 198. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 21 and 199
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