When you ask "What number is halfway between 51 and 189?" 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=189.
To find the number halfway between 51 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 189 into our formula, we get:
(51 + 189)/2 = 120
Thus, the number halfway between 51 and 189 is 120.
To check that our answer is correct, we subtract 51 from 120 and subtract 120 from 189 and compare the two numbers:
120 - 51 = 69
189 - 120 = 69
As you can see, the halfway number is 69 higher than 51 and 69 lower than 189. Therefore, our halfway between answer of 120 above is correct.
Halfway Between
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Halfway Between 51 and 190
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