When you ask "What number is halfway between 9 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=9 and Y=149.
To find the number halfway between 9 and 149, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 149 into our formula, we get:
(9 + 149)/2 = 79
Thus, the number halfway between 9 and 149 is 79.
To check that our answer is correct, we subtract 9 from 79 and subtract 79 from 149 and compare the two numbers:
79 - 9 = 70
149 - 79 = 70
As you can see, the halfway number is 70 higher than 9 and 70 lower than 149. Therefore, our halfway between answer of 79 above is correct.
Halfway Between
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Halfway Between 9 and 150
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