When you ask "What number is halfway between 10 and 397?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=397.
To find the number halfway between 10 and 397, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 397 into our formula, we get:
(10 + 397)/2 = 203.5
Thus, the number halfway between 10 and 397 is 203.5.
To check that our answer is correct, we subtract 10 from 203.5 and subtract 203.5 from 397 and compare the two numbers:
203.5 - 10 = 193.5
397 - 203.5 = 193.5
As you can see, the halfway number is 193.5 higher than 10 and 193.5 lower than 397. Therefore, our halfway between answer of 203.5 above is correct.
Halfway Between
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Halfway Between 10 and 398
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