When you ask "What number is halfway between 86 and 153?" 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=153.
To find the number halfway between 86 and 153, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 153 into our formula, we get:
(86 + 153)/2 = 119.5
Thus, the number halfway between 86 and 153 is 119.5.
To check that our answer is correct, we subtract 86 from 119.5 and subtract 119.5 from 153 and compare the two numbers:
119.5 - 86 = 33.5
153 - 119.5 = 33.5
As you can see, the halfway number is 33.5 higher than 86 and 33.5 lower than 153. Therefore, our halfway between answer of 119.5 above is correct.
Halfway Between
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Halfway Between 86 and 154
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