When you ask "What number is halfway between 18 and 720?" 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=720.
To find the number halfway between 18 and 720, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 720 into our formula, we get:
(18 + 720)/2 = 369
Thus, the number halfway between 18 and 720 is 369.
To check that our answer is correct, we subtract 18 from 369 and subtract 369 from 720 and compare the two numbers:
369 - 18 = 351
720 - 369 = 351
As you can see, the halfway number is 351 higher than 18 and 351 lower than 720. Therefore, our halfway between answer of 369 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 18 and 721
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