When you ask "What number is halfway between 42 and 220?" 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=220.
To find the number halfway between 42 and 220, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 42 and 220 into our formula, we get:
(42 + 220)/2 = 131
Thus, the number halfway between 42 and 220 is 131.
To check that our answer is correct, we subtract 42 from 131 and subtract 131 from 220 and compare the two numbers:
131 - 42 = 89
220 - 131 = 89
As you can see, the halfway number is 89 higher than 42 and 89 lower than 220. Therefore, our halfway between answer of 131 above is correct.
Halfway Between
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Halfway Between 42 and 221
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