When you ask "What number is halfway between 100 and 919?" 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=919.
To find the number halfway between 100 and 919, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 919 into our formula, we get:
(100 + 919)/2 = 509.5
Thus, the number halfway between 100 and 919 is 509.5.
To check that our answer is correct, we subtract 100 from 509.5 and subtract 509.5 from 919 and compare the two numbers:
509.5 - 100 = 409.5
919 - 509.5 = 409.5
As you can see, the halfway number is 409.5 higher than 100 and 409.5 lower than 919. Therefore, our halfway between answer of 509.5 above is correct.
Halfway Between
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Halfway Between 100 and 920
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