When you ask "What number is halfway between 100 and 279?" 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=279.
To find the number halfway between 100 and 279, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 279 into our formula, we get:
(100 + 279)/2 = 189.5
Thus, the number halfway between 100 and 279 is 189.5.
To check that our answer is correct, we subtract 100 from 189.5 and subtract 189.5 from 279 and compare the two numbers:
189.5 - 100 = 89.5
279 - 189.5 = 89.5
As you can see, the halfway number is 89.5 higher than 100 and 89.5 lower than 279. Therefore, our halfway between answer of 189.5 above is correct.
Halfway Between
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Halfway Between 100 and 280
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