When you ask "What number is halfway between 31 and 148?" 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=148.
To find the number halfway between 31 and 148, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 148 into our formula, we get:
(31 + 148)/2 = 89.5
Thus, the number halfway between 31 and 148 is 89.5.
To check that our answer is correct, we subtract 31 from 89.5 and subtract 89.5 from 148 and compare the two numbers:
89.5 - 31 = 58.5
148 - 89.5 = 58.5
As you can see, the halfway number is 58.5 higher than 31 and 58.5 lower than 148. Therefore, our halfway between answer of 89.5 above is correct.
Halfway Between
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Halfway Between 31 and 149
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