When you ask "What number is halfway between 100 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=100 and Y=149.
To find the number halfway between 100 and 149, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 149 into our formula, we get:
(100 + 149)/2 = 124.5
Thus, the number halfway between 100 and 149 is 124.5.
To check that our answer is correct, we subtract 100 from 124.5 and subtract 124.5 from 149 and compare the two numbers:
124.5 - 100 = 24.5
149 - 124.5 = 24.5
As you can see, the halfway number is 24.5 higher than 100 and 24.5 lower than 149. Therefore, our halfway between answer of 124.5 above is correct.
Halfway Between
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Halfway Between 100 and 150
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