When you ask "What number is halfway between 1 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=1 and Y=121.
To find the number halfway between 1 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 121 into our formula, we get:
(1 + 121)/2 = 61
Thus, the number halfway between 1 and 121 is 61.
To check that our answer is correct, we subtract 1 from 61 and subtract 61 from 121 and compare the two numbers:
61 - 1 = 60
121 - 61 = 60
As you can see, the halfway number is 60 higher than 1 and 60 lower than 121. Therefore, our halfway between answer of 61 above is correct.
Halfway Between
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Halfway Between 1 and 122
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