When you ask "What number is halfway between 16 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=16 and Y=121.
To find the number halfway between 16 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 16 and 121 into our formula, we get:
(16 + 121)/2 = 68.5
Thus, the number halfway between 16 and 121 is 68.5.
To check that our answer is correct, we subtract 16 from 68.5 and subtract 68.5 from 121 and compare the two numbers:
68.5 - 16 = 52.5
121 - 68.5 = 52.5
As you can see, the halfway number is 52.5 higher than 16 and 52.5 lower than 121. Therefore, our halfway between answer of 68.5 above is correct.
Halfway Between
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Halfway Between 16 and 122
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