When you ask "What number is halfway between 42 and 289?" 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=289.
To find the number halfway between 42 and 289, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 289 into our formula, we get:
(42 + 289)/2 = 165.5
Thus, the number halfway between 42 and 289 is 165.5.
To check that our answer is correct, we subtract 42 from 165.5 and subtract 165.5 from 289 and compare the two numbers:
165.5 - 42 = 123.5
289 - 165.5 = 123.5
As you can see, the halfway number is 123.5 higher than 42 and 123.5 lower than 289. Therefore, our halfway between answer of 165.5 above is correct.
Halfway Between
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Halfway Between 42 and 290
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