When you ask "What number is halfway between 15 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=15 and Y=279.
To find the number halfway between 15 and 279, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 279 into our formula, we get:
(15 + 279)/2 = 147
Thus, the number halfway between 15 and 279 is 147.
To check that our answer is correct, we subtract 15 from 147 and subtract 147 from 279 and compare the two numbers:
147 - 15 = 132
279 - 147 = 132
As you can see, the halfway number is 132 higher than 15 and 132 lower than 279. Therefore, our halfway between answer of 147 above is correct.
Halfway Between
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Halfway Between 15 and 280
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