When you ask "What number is halfway between 18 and 660?" 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=660.
To find the number halfway between 18 and 660, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 660 into our formula, we get:
(18 + 660)/2 = 339
Thus, the number halfway between 18 and 660 is 339.
To check that our answer is correct, we subtract 18 from 339 and subtract 339 from 660 and compare the two numbers:
339 - 18 = 321
660 - 339 = 321
As you can see, the halfway number is 321 higher than 18 and 321 lower than 660. Therefore, our halfway between answer of 339 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 18 and 661
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