When you ask "What number is halfway between 20 and 216?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=216.
To find the number halfway between 20 and 216, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 216 into our formula, we get:
(20 + 216)/2 = 118
Thus, the number halfway between 20 and 216 is 118.
To check that our answer is correct, we subtract 20 from 118 and subtract 118 from 216 and compare the two numbers:
118 - 20 = 98
216 - 118 = 98
As you can see, the halfway number is 98 higher than 20 and 98 lower than 216. Therefore, our halfway between answer of 118 above is correct.
Halfway Between
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Halfway Between 20 and 217
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