When you ask "What number is halfway between 7 and 491?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=7 and Y=491.
To find the number halfway between 7 and 491, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 491 into our formula, we get:
(7 + 491)/2 = 249
Thus, the number halfway between 7 and 491 is 249.
To check that our answer is correct, we subtract 7 from 249 and subtract 249 from 491 and compare the two numbers:
249 - 7 = 242
491 - 249 = 242
As you can see, the halfway number is 242 higher than 7 and 242 lower than 491. Therefore, our halfway between answer of 249 above is correct.
Halfway Between
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Halfway Between 7 and 492
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