When you ask "What number is halfway between 91 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=91 and Y=154.
To find the number halfway between 91 and 154, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 91 and 154 into our formula, we get:
(91 + 154)/2 = 122.5
Thus, the number halfway between 91 and 154 is 122.5.
To check that our answer is correct, we subtract 91 from 122.5 and subtract 122.5 from 154 and compare the two numbers:
122.5 - 91 = 31.5
154 - 122.5 = 31.5
As you can see, the halfway number is 31.5 higher than 91 and 31.5 lower than 154. Therefore, our halfway between answer of 122.5 above is correct.
Halfway Between
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Halfway Between 91 and 155
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