When you ask "What number is halfway between 51 and 290?" 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=290.
To find the number halfway between 51 and 290, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 290 into our formula, we get:
(51 + 290)/2 = 170.5
Thus, the number halfway between 51 and 290 is 170.5.
To check that our answer is correct, we subtract 51 from 170.5 and subtract 170.5 from 290 and compare the two numbers:
170.5 - 51 = 119.5
290 - 170.5 = 119.5
As you can see, the halfway number is 119.5 higher than 51 and 119.5 lower than 290. Therefore, our halfway between answer of 170.5 above is correct.
Halfway Between
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Halfway Between 51 and 291
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