When you ask "What number is halfway between 42 and 291?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=291.
To find the number halfway between 42 and 291, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 291 into our formula, we get:
(42 + 291)/2 = 166.5
Thus, the number halfway between 42 and 291 is 166.5.
To check that our answer is correct, we subtract 42 from 166.5 and subtract 166.5 from 291 and compare the two numbers:
166.5 - 42 = 124.5
291 - 166.5 = 124.5
As you can see, the halfway number is 124.5 higher than 42 and 124.5 lower than 291. Therefore, our halfway between answer of 166.5 above is correct.
Halfway Between
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Halfway Between 42 and 292
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