When you ask "What number is halfway between 12 and 545?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=12 and Y=545.
To find the number halfway between 12 and 545, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 545 into our formula, we get:
(12 + 545)/2 = 278.5
Thus, the number halfway between 12 and 545 is 278.5.
To check that our answer is correct, we subtract 12 from 278.5 and subtract 278.5 from 545 and compare the two numbers:
278.5 - 12 = 266.5
545 - 278.5 = 266.5
As you can see, the halfway number is 266.5 higher than 12 and 266.5 lower than 545. Therefore, our halfway between answer of 278.5 above is correct.
Halfway Between
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Halfway Between 12 and 546
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