When you ask "What number is halfway between 70 and 405?" 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=405.
To find the number halfway between 70 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 405 into our formula, we get:
(70 + 405)/2 = 237.5
Thus, the number halfway between 70 and 405 is 237.5.
To check that our answer is correct, we subtract 70 from 237.5 and subtract 237.5 from 405 and compare the two numbers:
237.5 - 70 = 167.5
405 - 237.5 = 167.5
As you can see, the halfway number is 167.5 higher than 70 and 167.5 lower than 405. Therefore, our halfway between answer of 237.5 above is correct.
Halfway Between
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Halfway Between 70 and 406
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