When you ask "What number is halfway between 10 and 289?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=10 and Y=289.
To find the number halfway between 10 and 289, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 289 into our formula, we get:
(10 + 289)/2 = 149.5
Thus, the number halfway between 10 and 289 is 149.5.
To check that our answer is correct, we subtract 10 from 149.5 and subtract 149.5 from 289 and compare the two numbers:
149.5 - 10 = 139.5
289 - 149.5 = 139.5
As you can see, the halfway number is 139.5 higher than 10 and 139.5 lower than 289. Therefore, our halfway between answer of 149.5 above is correct.
Halfway Between
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Halfway Between 10 and 290
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