When you ask "What number is halfway between 70 and 665?" 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=665.
To find the number halfway between 70 and 665, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 665 into our formula, we get:
(70 + 665)/2 = 367.5
Thus, the number halfway between 70 and 665 is 367.5.
To check that our answer is correct, we subtract 70 from 367.5 and subtract 367.5 from 665 and compare the two numbers:
367.5 - 70 = 297.5
665 - 367.5 = 297.5
As you can see, the halfway number is 297.5 higher than 70 and 297.5 lower than 665. Therefore, our halfway between answer of 367.5 above is correct.
Halfway Between
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Halfway Between 70 and 666
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