When you ask "What number is halfway between 21 and 161?" 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=161.
To find the number halfway between 21 and 161, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 161 into our formula, we get:
(21 + 161)/2 = 91
Thus, the number halfway between 21 and 161 is 91.
To check that our answer is correct, we subtract 21 from 91 and subtract 91 from 161 and compare the two numbers:
91 - 21 = 70
161 - 91 = 70
As you can see, the halfway number is 70 higher than 21 and 70 lower than 161. Therefore, our halfway between answer of 91 above is correct.
Halfway Between
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Halfway Between 21 and 162
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