When you ask "What number is halfway between 15 and 69?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=69.
To find the number halfway between 15 and 69, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 69 into our formula, we get:
(15 + 69)/2 = 42
Thus, the number halfway between 15 and 69 is 42.
To check that our answer is correct, we subtract 15 from 42 and subtract 42 from 69 and compare the two numbers:
42 - 15 = 27
69 - 42 = 27
As you can see, the halfway number is 27 higher than 15 and 27 lower than 69. Therefore, our halfway between answer of 42 above is correct.
Halfway Between
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Halfway Between 15 and 70
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