When you ask "What number is halfway between 69 and 128?" 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=128.
To find the number halfway between 69 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 128 into our formula, we get:
(69 + 128)/2 = 98.5
Thus, the number halfway between 69 and 128 is 98.5.
To check that our answer is correct, we subtract 69 from 98.5 and subtract 98.5 from 128 and compare the two numbers:
98.5 - 69 = 29.5
128 - 98.5 = 29.5
As you can see, the halfway number is 29.5 higher than 69 and 29.5 lower than 128. Therefore, our halfway between answer of 98.5 above is correct.
Halfway Between
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Halfway Between 69 and 129
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