When you ask "What number is halfway between 12 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=12 and Y=128.
To find the number halfway between 12 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 128 into our formula, we get:
(12 + 128)/2 = 70
Thus, the number halfway between 12 and 128 is 70.
To check that our answer is correct, we subtract 12 from 70 and subtract 70 from 128 and compare the two numbers:
70 - 12 = 58
128 - 70 = 58
As you can see, the halfway number is 58 higher than 12 and 58 lower than 128. Therefore, our halfway between answer of 70 above is correct.
Halfway Between
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Halfway Between 12 and 129
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