When you ask "What number is halfway between 15 and 1000?" 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=1000.
To find the number halfway between 15 and 1000, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 1000 into our formula, we get:
(15 + 1000)/2 = 507.5
Thus, the number halfway between 15 and 1000 is 507.5.
To check that our answer is correct, we subtract 15 from 507.5 and subtract 507.5 from 1000 and compare the two numbers:
507.5 - 15 = 492.5
1000 - 507.5 = 492.5
As you can see, the halfway number is 492.5 higher than 15 and 492.5 lower than 1000. Therefore, our halfway between answer of 507.5 above is correct.
Halfway Between
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