When you ask "What number is halfway between 31 and 154?" 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=154.
To find the number halfway between 31 and 154, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 154 into our formula, we get:
(31 + 154)/2 = 92.5
Thus, the number halfway between 31 and 154 is 92.5.
To check that our answer is correct, we subtract 31 from 92.5 and subtract 92.5 from 154 and compare the two numbers:
92.5 - 31 = 61.5
154 - 92.5 = 61.5
As you can see, the halfway number is 61.5 higher than 31 and 61.5 lower than 154. Therefore, our halfway between answer of 92.5 above is correct.
Halfway Between
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Halfway Between 31 and 155
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