When you ask "What number is halfway between 54 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=54 and Y=69.
To find the number halfway between 54 and 69, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 54 and 69 into our formula, we get:
(54 + 69)/2 = 61.5
Thus, the number halfway between 54 and 69 is 61.5.
To check that our answer is correct, we subtract 54 from 61.5 and subtract 61.5 from 69 and compare the two numbers:
61.5 - 54 = 7.5
69 - 61.5 = 7.5
As you can see, the halfway number is 7.5 higher than 54 and 7.5 lower than 69. Therefore, our halfway between answer of 61.5 above is correct.
Halfway Between
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Halfway Between 54 and 70
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