Halfway Between 15 and 509

When you ask "What number is halfway between 15 and 509?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=509.

Halfway Between Line

To find the number halfway between 15 and 509, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 15 and 509 into our formula, we get:

(15 + 509)/2 = 262

Thus, the number halfway between 15 and 509 is 262.

To check that our answer is correct, we subtract 15 from 262 and subtract 262 from 509 and compare the two numbers:

262 - 15 = 247
509 - 262 = 247

As you can see, the halfway number is 247 higher than 15 and 247 lower than 509. Therefore, our halfway between answer of 262 above is correct.

Halfway Between
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Halfway Between 15 and 510
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