When you ask "What number is halfway between 86 and 149?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=86 and Y=149.
To find the number halfway between 86 and 149, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 149 into our formula, we get:
(86 + 149)/2 = 117.5
Thus, the number halfway between 86 and 149 is 117.5.
To check that our answer is correct, we subtract 86 from 117.5 and subtract 117.5 from 149 and compare the two numbers:
117.5 - 86 = 31.5
149 - 117.5 = 31.5
As you can see, the halfway number is 31.5 higher than 86 and 31.5 lower than 149. Therefore, our halfway between answer of 117.5 above is correct.
Halfway Between
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Halfway Between 86 and 150
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