When you ask "What number is halfway between 21 and 237?" 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=237.
To find the number halfway between 21 and 237, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 237 into our formula, we get:
(21 + 237)/2 = 129
Thus, the number halfway between 21 and 237 is 129.
To check that our answer is correct, we subtract 21 from 129 and subtract 129 from 237 and compare the two numbers:
129 - 21 = 108
237 - 129 = 108
As you can see, the halfway number is 108 higher than 21 and 108 lower than 237. Therefore, our halfway between answer of 129 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 21 and 238
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