When you ask "What number is halfway between 90 and 143?" 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=143.
To find the number halfway between 90 and 143, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 143 into our formula, we get:
(90 + 143)/2 = 116.5
Thus, the number halfway between 90 and 143 is 116.5.
To check that our answer is correct, we subtract 90 from 116.5 and subtract 116.5 from 143 and compare the two numbers:
116.5 - 90 = 26.5
143 - 116.5 = 26.5
As you can see, the halfway number is 26.5 higher than 90 and 26.5 lower than 143. Therefore, our halfway between answer of 116.5 above is correct.
Halfway Between
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Halfway Between 90 and 144
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