When you ask "What number is halfway between 7 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=7 and Y=121.
To find the number halfway between 7 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 121 into our formula, we get:
(7 + 121)/2 = 64
Thus, the number halfway between 7 and 121 is 64.
To check that our answer is correct, we subtract 7 from 64 and subtract 64 from 121 and compare the two numbers:
64 - 7 = 57
121 - 64 = 57
As you can see, the halfway number is 57 higher than 7 and 57 lower than 121. Therefore, our halfway between answer of 64 above is correct.
Halfway Between
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Halfway Between 7 and 122
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