When you ask "What number is halfway between 51 and 91?" 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=91.
To find the number halfway between 51 and 91, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 91 into our formula, we get:
(51 + 91)/2 = 71
Thus, the number halfway between 51 and 91 is 71.
To check that our answer is correct, we subtract 51 from 71 and subtract 71 from 91 and compare the two numbers:
71 - 51 = 20
91 - 71 = 20
As you can see, the halfway number is 20 higher than 51 and 20 lower than 91. Therefore, our halfway between answer of 71 above is correct.
Halfway Between
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Halfway Between 51 and 92
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