When you ask "What number is halfway between 21 and 119?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=119.
To find the number halfway between 21 and 119, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 119 into our formula, we get:
(21 + 119)/2 = 70
Thus, the number halfway between 21 and 119 is 70.
To check that our answer is correct, we subtract 21 from 70 and subtract 70 from 119 and compare the two numbers:
70 - 21 = 49
119 - 70 = 49
As you can see, the halfway number is 49 higher than 21 and 49 lower than 119. Therefore, our halfway between answer of 70 above is correct.
Halfway Between
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Halfway Between 21 and 120
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