When you ask "What number is halfway between 18 and 658?" 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=658.
To find the number halfway between 18 and 658, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 658 into our formula, we get:
(18 + 658)/2 = 338
Thus, the number halfway between 18 and 658 is 338.
To check that our answer is correct, we subtract 18 from 338 and subtract 338 from 658 and compare the two numbers:
338 - 18 = 320
658 - 338 = 320
As you can see, the halfway number is 320 higher than 18 and 320 lower than 658. Therefore, our halfway between answer of 338 above is correct.
Halfway Between
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Halfway Between 18 and 659
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