When you ask "What number is halfway between 42 and 390?" 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=390.
To find the number halfway between 42 and 390, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 390 into our formula, we get:
(42 + 390)/2 = 216
Thus, the number halfway between 42 and 390 is 216.
To check that our answer is correct, we subtract 42 from 216 and subtract 216 from 390 and compare the two numbers:
216 - 42 = 174
390 - 216 = 174
As you can see, the halfway number is 174 higher than 42 and 174 lower than 390. Therefore, our halfway between answer of 216 above is correct.
Halfway Between
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Halfway Between 42 and 391
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