When you ask "What number is halfway between 100 and 803?" 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=803.
To find the number halfway between 100 and 803, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 803 into our formula, we get:
(100 + 803)/2 = 451.5
Thus, the number halfway between 100 and 803 is 451.5.
To check that our answer is correct, we subtract 100 from 451.5 and subtract 451.5 from 803 and compare the two numbers:
451.5 - 100 = 351.5
803 - 451.5 = 351.5
As you can see, the halfway number is 351.5 higher than 100 and 351.5 lower than 803. Therefore, our halfway between answer of 451.5 above is correct.
Halfway Between
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Halfway Between 100 and 804
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