When you ask "What number is halfway between 70 and 647?" 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=647.
To find the number halfway between 70 and 647, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 647 into our formula, we get:
(70 + 647)/2 = 358.5
Thus, the number halfway between 70 and 647 is 358.5.
To check that our answer is correct, we subtract 70 from 358.5 and subtract 358.5 from 647 and compare the two numbers:
358.5 - 70 = 288.5
647 - 358.5 = 288.5
As you can see, the halfway number is 288.5 higher than 70 and 288.5 lower than 647. Therefore, our halfway between answer of 358.5 above is correct.
Halfway Between
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Halfway Between 70 and 648
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