When you ask "What number is halfway between 4 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=4 and Y=121.
To find the number halfway between 4 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 121 into our formula, we get:
(4 + 121)/2 = 62.5
Thus, the number halfway between 4 and 121 is 62.5.
To check that our answer is correct, we subtract 4 from 62.5 and subtract 62.5 from 121 and compare the two numbers:
62.5 - 4 = 58.5
121 - 62.5 = 58.5
As you can see, the halfway number is 58.5 higher than 4 and 58.5 lower than 121. Therefore, our halfway between answer of 62.5 above is correct.
Halfway Between
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Halfway Between 4 and 122
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