When you ask "What number is halfway between 90 and 159?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=90 and Y=159.
To find the number halfway between 90 and 159, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 159 into our formula, we get:
(90 + 159)/2 = 124.5
Thus, the number halfway between 90 and 159 is 124.5.
To check that our answer is correct, we subtract 90 from 124.5 and subtract 124.5 from 159 and compare the two numbers:
124.5 - 90 = 34.5
159 - 124.5 = 34.5
As you can see, the halfway number is 34.5 higher than 90 and 34.5 lower than 159. Therefore, our halfway between answer of 124.5 above is correct.
Halfway Between
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Halfway Between 90 and 160
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