When you ask "What number is halfway between 7 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=7 and Y=513.
To find the number halfway between 7 and 513, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 513 into our formula, we get:
(7 + 513)/2 = 260
Thus, the number halfway between 7 and 513 is 260.
To check that our answer is correct, we subtract 7 from 260 and subtract 260 from 513 and compare the two numbers:
260 - 7 = 253
513 - 260 = 253
As you can see, the halfway number is 253 higher than 7 and 253 lower than 513. Therefore, our halfway between answer of 260 above is correct.
Halfway Between
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