When you ask "What number is halfway between 17 and 123?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=123.
To find the number halfway between 17 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 123 into our formula, we get:
(17 + 123)/2 = 70
Thus, the number halfway between 17 and 123 is 70.
To check that our answer is correct, we subtract 17 from 70 and subtract 70 from 123 and compare the two numbers:
70 - 17 = 53
123 - 70 = 53
As you can see, the halfway number is 53 higher than 17 and 53 lower than 123. Therefore, our halfway between answer of 70 above is correct.
Halfway Between
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Halfway Between 17 and 124
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