When you ask "What number is halfway between 19 and 66?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=19 and Y=66.
To find the number halfway between 19 and 66, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 19 and 66 into our formula, we get:
(19 + 66)/2 = 42.5
Thus, the number halfway between 19 and 66 is 42.5.
To check that our answer is correct, we subtract 19 from 42.5 and subtract 42.5 from 66 and compare the two numbers:
42.5 - 19 = 23.5
66 - 42.5 = 23.5
As you can see, the halfway number is 23.5 higher than 19 and 23.5 lower than 66. Therefore, our halfway between answer of 42.5 above is correct.
Halfway Between
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Halfway Between 19 and 67
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