When you ask "What number is halfway between 15 and 550?" 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=550.
To find the number halfway between 15 and 550, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 550 into our formula, we get:
(15 + 550)/2 = 282.5
Thus, the number halfway between 15 and 550 is 282.5.
To check that our answer is correct, we subtract 15 from 282.5 and subtract 282.5 from 550 and compare the two numbers:
282.5 - 15 = 267.5
550 - 282.5 = 267.5
As you can see, the halfway number is 267.5 higher than 15 and 267.5 lower than 550. Therefore, our halfway between answer of 282.5 above is correct.
Halfway Between
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Halfway Between 15 and 551
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