When you ask "What number is halfway between 100 and 905?" 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=905.
To find the number halfway between 100 and 905, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 905 into our formula, we get:
(100 + 905)/2 = 502.5
Thus, the number halfway between 100 and 905 is 502.5.
To check that our answer is correct, we subtract 100 from 502.5 and subtract 502.5 from 905 and compare the two numbers:
502.5 - 100 = 402.5
905 - 502.5 = 402.5
As you can see, the halfway number is 402.5 higher than 100 and 402.5 lower than 905. Therefore, our halfway between answer of 502.5 above is correct.
Halfway Between
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Halfway Between 100 and 906
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