When you ask "What number is halfway between 19 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=19 and Y=121.
To find the number halfway between 19 and 121, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 19 and 121 into our formula, we get:
(19 + 121)/2 = 70
Thus, the number halfway between 19 and 121 is 70.
To check that our answer is correct, we subtract 19 from 70 and subtract 70 from 121 and compare the two numbers:
70 - 19 = 51
121 - 70 = 51
As you can see, the halfway number is 51 higher than 19 and 51 lower than 121. Therefore, our halfway between answer of 70 above is correct.
Halfway Between
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Halfway Between 19 and 122
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