When you ask "What number is halfway between 21 and 150?" 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=150.
To find the number halfway between 21 and 150, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 150 into our formula, we get:
(21 + 150)/2 = 85.5
Thus, the number halfway between 21 and 150 is 85.5.
To check that our answer is correct, we subtract 21 from 85.5 and subtract 85.5 from 150 and compare the two numbers:
85.5 - 21 = 64.5
150 - 85.5 = 64.5
As you can see, the halfway number is 64.5 higher than 21 and 64.5 lower than 150. Therefore, our halfway between answer of 85.5 above is correct.
Halfway Between
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Halfway Between 21 and 151
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