
When you ask "What number is halfway between 4 and 197?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=4 and Y=197.

To find the number halfway between 4 and 197, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 197 into our formula, we get:
(4 + 197)/2 = 100.5
Thus, the number halfway between 4 and 197 is 100.5.
To check that our answer is correct, we subtract 4 from 100.5 and subtract 100.5 from 197 and compare the two numbers:
100.5 - 4 = 96.5
197 - 100.5 = 96.5
As you can see, the halfway number is 96.5 higher than 4 and 96.5 lower than 197. Therefore, our halfway between answer of 100.5 above is correct.
Halfway Between
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Halfway Between 4 and 198
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