When you ask "What number is halfway between 100 and 497?" 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=497.
To find the number halfway between 100 and 497, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 497 into our formula, we get:
(100 + 497)/2 = 298.5
Thus, the number halfway between 100 and 497 is 298.5.
To check that our answer is correct, we subtract 100 from 298.5 and subtract 298.5 from 497 and compare the two numbers:
298.5 - 100 = 198.5
497 - 298.5 = 198.5
As you can see, the halfway number is 198.5 higher than 100 and 198.5 lower than 497. Therefore, our halfway between answer of 298.5 above is correct.
Halfway Between
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Halfway Between 100 and 498
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