When you ask "What number is halfway between 89 and 378?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=89 and Y=378.
To find the number halfway between 89 and 378, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 89 and 378 into our formula, we get:
(89 + 378)/2 = 233.5
Thus, the number halfway between 89 and 378 is 233.5.
To check that our answer is correct, we subtract 89 from 233.5 and subtract 233.5 from 378 and compare the two numbers:
233.5 - 89 = 144.5
378 - 233.5 = 144.5
As you can see, the halfway number is 144.5 higher than 89 and 144.5 lower than 378. Therefore, our halfway between answer of 233.5 above is correct.
Halfway Between
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Halfway Between 89 and 379
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