When you ask "What number is halfway between 51 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=51 and Y=378.
To find the number halfway between 51 and 378, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 378 into our formula, we get:
(51 + 378)/2 = 214.5
Thus, the number halfway between 51 and 378 is 214.5.
To check that our answer is correct, we subtract 51 from 214.5 and subtract 214.5 from 378 and compare the two numbers:
214.5 - 51 = 163.5
378 - 214.5 = 163.5
As you can see, the halfway number is 163.5 higher than 51 and 163.5 lower than 378. Therefore, our halfway between answer of 214.5 above is correct.
Halfway Between
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Halfway Between 51 and 379
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