When you ask "What number is halfway between 42 and 945?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=42 and Y=945.
To find the number halfway between 42 and 945, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 945 into our formula, we get:
(42 + 945)/2 = 493.5
Thus, the number halfway between 42 and 945 is 493.5.
To check that our answer is correct, we subtract 42 from 493.5 and subtract 493.5 from 945 and compare the two numbers:
493.5 - 42 = 451.5
945 - 493.5 = 451.5
As you can see, the halfway number is 451.5 higher than 42 and 451.5 lower than 945. Therefore, our halfway between answer of 493.5 above is correct.
Halfway Between
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Halfway Between 42 and 946
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