When you ask "What number is halfway between 68 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=68 and Y=149.
To find the number halfway between 68 and 149, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 68 and 149 into our formula, we get:
(68 + 149)/2 = 108.5
Thus, the number halfway between 68 and 149 is 108.5.
To check that our answer is correct, we subtract 68 from 108.5 and subtract 108.5 from 149 and compare the two numbers:
108.5 - 68 = 40.5
149 - 108.5 = 40.5
As you can see, the halfway number is 40.5 higher than 68 and 40.5 lower than 149. Therefore, our halfway between answer of 108.5 above is correct.
Halfway Between
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Halfway Between 68 and 150
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