
When you ask "What number is halfway between 7 and 51?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=51.

To find the number halfway between 7 and 51, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 51 into our formula, we get:
(7 + 51)/2 = 29
Thus, the number halfway between 7 and 51 is 29.
To check that our answer is correct, we subtract 7 from 29 and subtract 29 from 51 and compare the two numbers:
29 - 7 = 22
51 - 29 = 22
As you can see, the halfway number is 22 higher than 7 and 22 lower than 51. Therefore, our halfway between answer of 29 above is correct.
Halfway Between
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Halfway Between 7 and 52
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