When you ask "What number is halfway between 69 and 487?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=69 and Y=487.
To find the number halfway between 69 and 487, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 69 and 487 into our formula, we get:
(69 + 487)/2 = 278
Thus, the number halfway between 69 and 487 is 278.
To check that our answer is correct, we subtract 69 from 278 and subtract 278 from 487 and compare the two numbers:
278 - 69 = 209
487 - 278 = 209
As you can see, the halfway number is 209 higher than 69 and 209 lower than 487. Therefore, our halfway between answer of 278 above is correct.
Halfway Between
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Halfway Between 69 and 488
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