When you ask "What number is halfway between 90 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=90 and Y=197.
To find the number halfway between 90 and 197, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 197 into our formula, we get:
(90 + 197)/2 = 143.5
Thus, the number halfway between 90 and 197 is 143.5.
To check that our answer is correct, we subtract 90 from 143.5 and subtract 143.5 from 197 and compare the two numbers:
143.5 - 90 = 53.5
197 - 143.5 = 53.5
As you can see, the halfway number is 53.5 higher than 90 and 53.5 lower than 197. Therefore, our halfway between answer of 143.5 above is correct.
Halfway Between
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Halfway Between 90 and 198
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