When you ask "What number is halfway between 21 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=21 and Y=289.
To find the number halfway between 21 and 289, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 289 into our formula, we get:
(21 + 289)/2 = 155
Thus, the number halfway between 21 and 289 is 155.
To check that our answer is correct, we subtract 21 from 155 and subtract 155 from 289 and compare the two numbers:
155 - 21 = 134
289 - 155 = 134
As you can see, the halfway number is 134 higher than 21 and 134 lower than 289. Therefore, our halfway between answer of 155 above is correct.
Halfway Between
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Halfway Between 21 and 290
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