When you ask "What number is halfway between 69 and 172?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=69 and Y=172.
To find the number halfway between 69 and 172, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 172 into our formula, we get:
(69 + 172)/2 = 120.5
Thus, the number halfway between 69 and 172 is 120.5.
To check that our answer is correct, we subtract 69 from 120.5 and subtract 120.5 from 172 and compare the two numbers:
120.5 - 69 = 51.5
172 - 120.5 = 51.5
As you can see, the halfway number is 51.5 higher than 69 and 51.5 lower than 172. Therefore, our halfway between answer of 120.5 above is correct.
Halfway Between
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Halfway Between 69 and 173
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