When you ask "What number is halfway between 70 and 129?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=70 and Y=129.
To find the number halfway between 70 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 129 into our formula, we get:
(70 + 129)/2 = 99.5
Thus, the number halfway between 70 and 129 is 99.5.
To check that our answer is correct, we subtract 70 from 99.5 and subtract 99.5 from 129 and compare the two numbers:
99.5 - 70 = 29.5
129 - 99.5 = 29.5
As you can see, the halfway number is 29.5 higher than 70 and 29.5 lower than 129. Therefore, our halfway between answer of 99.5 above is correct.
Halfway Between
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Halfway Between 70 and 130
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