When you ask "What number is halfway between 71 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=71 and Y=100.
To find the number halfway between 71 and 100, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 100 into our formula, we get:
(71 + 100)/2 = 85.5
Thus, the number halfway between 71 and 100 is 85.5.
To check that our answer is correct, we subtract 71 from 85.5 and subtract 85.5 from 100 and compare the two numbers:
85.5 - 71 = 14.5
100 - 85.5 = 14.5
As you can see, the halfway number is 14.5 higher than 71 and 14.5 lower than 100. Therefore, our halfway between answer of 85.5 above is correct.
Halfway Between
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Halfway Between 71 and 101
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