When you ask "What number is halfway between 20 and 266?" 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=266.
To find the number halfway between 20 and 266, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 266 into our formula, we get:
(20 + 266)/2 = 143
Thus, the number halfway between 20 and 266 is 143.
To check that our answer is correct, we subtract 20 from 143 and subtract 143 from 266 and compare the two numbers:
143 - 20 = 123
266 - 143 = 123
As you can see, the halfway number is 123 higher than 20 and 123 lower than 266. Therefore, our halfway between answer of 143 above is correct.
Halfway Between
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Halfway Between 20 and 267
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