When you ask "What number is halfway between 31 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=31 and Y=150.
To find the number halfway between 31 and 150, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 150 into our formula, we get:
(31 + 150)/2 = 90.5
Thus, the number halfway between 31 and 150 is 90.5.
To check that our answer is correct, we subtract 31 from 90.5 and subtract 90.5 from 150 and compare the two numbers:
90.5 - 31 = 59.5
150 - 90.5 = 59.5
As you can see, the halfway number is 59.5 higher than 31 and 59.5 lower than 150. Therefore, our halfway between answer of 90.5 above is correct.
Halfway Between
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Halfway Between 31 and 151
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