When you ask "What number is halfway between 100 and 921?" 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=921.
To find the number halfway between 100 and 921, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 921 into our formula, we get:
(100 + 921)/2 = 510.5
Thus, the number halfway between 100 and 921 is 510.5.
To check that our answer is correct, we subtract 100 from 510.5 and subtract 510.5 from 921 and compare the two numbers:
510.5 - 100 = 410.5
921 - 510.5 = 410.5
As you can see, the halfway number is 410.5 higher than 100 and 410.5 lower than 921. Therefore, our halfway between answer of 510.5 above is correct.
Halfway Between
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Halfway Between 100 and 922
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