
When you ask "What number is halfway between 42 and 356?" 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=356.

To find the number halfway between 42 and 356, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 356 into our formula, we get:
(42 + 356)/2 = 199
Thus, the number halfway between 42 and 356 is 199.
To check that our answer is correct, we subtract 42 from 199 and subtract 199 from 356 and compare the two numbers:
199 - 42 = 157
356 - 199 = 157
As you can see, the halfway number is 157 higher than 42 and 157 lower than 356. Therefore, our halfway between answer of 199 above is correct.
Halfway Between
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Halfway Between 42 and 357
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