When you ask "What number is halfway between 85 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=85 and Y=154.
To find the number halfway between 85 and 154, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 154 into our formula, we get:
(85 + 154)/2 = 119.5
Thus, the number halfway between 85 and 154 is 119.5.
To check that our answer is correct, we subtract 85 from 119.5 and subtract 119.5 from 154 and compare the two numbers:
119.5 - 85 = 34.5
154 - 119.5 = 34.5
As you can see, the halfway number is 34.5 higher than 85 and 34.5 lower than 154. Therefore, our halfway between answer of 119.5 above is correct.
Halfway Between
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Halfway Between 85 and 155
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