When you ask "What number is halfway between 66 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=66 and Y=69.
To find the number halfway between 66 and 69, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 69 into our formula, we get:
(66 + 69)/2 = 67.5
Thus, the number halfway between 66 and 69 is 67.5.
To check that our answer is correct, we subtract 66 from 67.5 and subtract 67.5 from 69 and compare the two numbers:
67.5 - 66 = 1.5
69 - 67.5 = 1.5
As you can see, the halfway number is 1.5 higher than 66 and 1.5 lower than 69. Therefore, our halfway between answer of 67.5 above is correct.
Halfway Between
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Halfway Between 66 and 70
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