When you ask "What number is halfway between 89 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=89 and Y=149.
To find the number halfway between 89 and 149, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 89 and 149 into our formula, we get:
(89 + 149)/2 = 119
Thus, the number halfway between 89 and 149 is 119.
To check that our answer is correct, we subtract 89 from 119 and subtract 119 from 149 and compare the two numbers:
119 - 89 = 30
149 - 119 = 30
As you can see, the halfway number is 30 higher than 89 and 30 lower than 149. Therefore, our halfway between answer of 119 above is correct.
Halfway Between
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Halfway Between 89 and 150
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