When you ask "What number is halfway between 21 and 160?" 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=160.
To find the number halfway between 21 and 160, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 160 into our formula, we get:
(21 + 160)/2 = 90.5
Thus, the number halfway between 21 and 160 is 90.5.
To check that our answer is correct, we subtract 21 from 90.5 and subtract 90.5 from 160 and compare the two numbers:
90.5 - 21 = 69.5
160 - 90.5 = 69.5
As you can see, the halfway number is 69.5 higher than 21 and 69.5 lower than 160. Therefore, our halfway between answer of 90.5 above is correct.
Halfway Between
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Halfway Between 21 and 161
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