When you ask "What number is halfway between 10 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=10 and Y=149.
To find the number halfway between 10 and 149, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 149 into our formula, we get:
(10 + 149)/2 = 79.5
Thus, the number halfway between 10 and 149 is 79.5.
To check that our answer is correct, we subtract 10 from 79.5 and subtract 79.5 from 149 and compare the two numbers:
79.5 - 10 = 69.5
149 - 79.5 = 69.5
As you can see, the halfway number is 69.5 higher than 10 and 69.5 lower than 149. Therefore, our halfway between answer of 79.5 above is correct.
Halfway Between
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Halfway Between 10 and 150
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