When you ask "What number is halfway between 100 and 137?" 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=137.
To find the number halfway between 100 and 137, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 137 into our formula, we get:
(100 + 137)/2 = 118.5
Thus, the number halfway between 100 and 137 is 118.5.
To check that our answer is correct, we subtract 100 from 118.5 and subtract 118.5 from 137 and compare the two numbers:
118.5 - 100 = 18.5
137 - 118.5 = 18.5
As you can see, the halfway number is 18.5 higher than 100 and 18.5 lower than 137. Therefore, our halfway between answer of 118.5 above is correct.
Halfway Between
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Halfway Between 100 and 138
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