When you ask "What number is halfway between 72 and 121?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=72 and Y=121.
To find the number halfway between 72 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 121 into our formula, we get:
(72 + 121)/2 = 96.5
Thus, the number halfway between 72 and 121 is 96.5.
To check that our answer is correct, we subtract 72 from 96.5 and subtract 96.5 from 121 and compare the two numbers:
96.5 - 72 = 24.5
121 - 96.5 = 24.5
As you can see, the halfway number is 24.5 higher than 72 and 24.5 lower than 121. Therefore, our halfway between answer of 96.5 above is correct.
Halfway Between
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Halfway Between 72 and 122
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