When you ask "What number is halfway between 50 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=50 and Y=149.
To find the number halfway between 50 and 149, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 50 and 149 into our formula, we get:
(50 + 149)/2 = 99.5
Thus, the number halfway between 50 and 149 is 99.5.
To check that our answer is correct, we subtract 50 from 99.5 and subtract 99.5 from 149 and compare the two numbers:
99.5 - 50 = 49.5
149 - 99.5 = 49.5
As you can see, the halfway number is 49.5 higher than 50 and 49.5 lower than 149. Therefore, our halfway between answer of 99.5 above is correct.
Halfway Between
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Halfway Between 50 and 150
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