When you ask "What number is halfway between 42 and 420?" 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=420.
To find the number halfway between 42 and 420, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 420 into our formula, we get:
(42 + 420)/2 = 231
Thus, the number halfway between 42 and 420 is 231.
To check that our answer is correct, we subtract 42 from 231 and subtract 231 from 420 and compare the two numbers:
231 - 42 = 189
420 - 231 = 189
As you can see, the halfway number is 189 higher than 42 and 189 lower than 420. Therefore, our halfway between answer of 231 above is correct.
Halfway Between
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Halfway Between 42 and 421
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