When you ask "What number is halfway between 18 and 516?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=516.
To find the number halfway between 18 and 516, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 516 into our formula, we get:
(18 + 516)/2 = 267
Thus, the number halfway between 18 and 516 is 267.
To check that our answer is correct, we subtract 18 from 267 and subtract 267 from 516 and compare the two numbers:
267 - 18 = 249
516 - 267 = 249
As you can see, the halfway number is 249 higher than 18 and 249 lower than 516. Therefore, our halfway between answer of 267 above is correct.
Halfway Between
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Halfway Between 18 and 517
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