When you ask "What number is halfway between 70 and 515?" 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=515.
To find the number halfway between 70 and 515, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 515 into our formula, we get:
(70 + 515)/2 = 292.5
Thus, the number halfway between 70 and 515 is 292.5.
To check that our answer is correct, we subtract 70 from 292.5 and subtract 292.5 from 515 and compare the two numbers:
292.5 - 70 = 222.5
515 - 292.5 = 222.5
As you can see, the halfway number is 222.5 higher than 70 and 222.5 lower than 515. Therefore, our halfway between answer of 292.5 above is correct.
Halfway Between
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Halfway Between 70 and 516
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