When you ask "What number is halfway between 42 and 278?" 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=278.
To find the number halfway between 42 and 278, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 278 into our formula, we get:
(42 + 278)/2 = 160
Thus, the number halfway between 42 and 278 is 160.
To check that our answer is correct, we subtract 42 from 160 and subtract 160 from 278 and compare the two numbers:
160 - 42 = 118
278 - 160 = 118
As you can see, the halfway number is 118 higher than 42 and 118 lower than 278. Therefore, our halfway between answer of 160 above is correct.
Halfway Between
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Halfway Between 42 and 279
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