When you ask "What number is halfway between 9 and 131?" 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=131.
To find the number halfway between 9 and 131, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 131 into our formula, we get:
(9 + 131)/2 = 70
Thus, the number halfway between 9 and 131 is 70.
To check that our answer is correct, we subtract 9 from 70 and subtract 70 from 131 and compare the two numbers:
70 - 9 = 61
131 - 70 = 61
As you can see, the halfway number is 61 higher than 9 and 61 lower than 131. Therefore, our halfway between answer of 70 above is correct.
Halfway Between
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Halfway Between 9 and 132
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