When you ask "What number is halfway between 51 and 100?" 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=100.
To find the number halfway between 51 and 100, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 100 into our formula, we get:
(51 + 100)/2 = 75.5
Thus, the number halfway between 51 and 100 is 75.5.
To check that our answer is correct, we subtract 51 from 75.5 and subtract 75.5 from 100 and compare the two numbers:
75.5 - 51 = 24.5
100 - 75.5 = 24.5
As you can see, the halfway number is 24.5 higher than 51 and 24.5 lower than 100. Therefore, our halfway between answer of 75.5 above is correct.
Halfway Between
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Halfway Between 51 and 101
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