When you ask "What number is halfway between 9 and 305?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=305.
To find the number halfway between 9 and 305, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 305 into our formula, we get:
(9 + 305)/2 = 157
Thus, the number halfway between 9 and 305 is 157.
To check that our answer is correct, we subtract 9 from 157 and subtract 157 from 305 and compare the two numbers:
157 - 9 = 148
305 - 157 = 148
As you can see, the halfway number is 148 higher than 9 and 148 lower than 305. Therefore, our halfway between answer of 157 above is correct.
Halfway Between
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Halfway Between 9 and 306
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