When you ask "What number is halfway between 70 and 513?" 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=513.
To find the number halfway between 70 and 513, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 70 and 513 into our formula, we get:
(70 + 513)/2 = 291.5
Thus, the number halfway between 70 and 513 is 291.5.
To check that our answer is correct, we subtract 70 from 291.5 and subtract 291.5 from 513 and compare the two numbers:
291.5 - 70 = 221.5
513 - 291.5 = 221.5
As you can see, the halfway number is 221.5 higher than 70 and 221.5 lower than 513. Therefore, our halfway between answer of 291.5 above is correct.
Halfway Between
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Halfway Between 70 and 514
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