When you ask "What number is halfway between 30 and 152?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=30 and Y=152.
To find the number halfway between 30 and 152, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 152 into our formula, we get:
(30 + 152)/2 = 91
Thus, the number halfway between 30 and 152 is 91.
To check that our answer is correct, we subtract 30 from 91 and subtract 91 from 152 and compare the two numbers:
91 - 30 = 61
152 - 91 = 61
As you can see, the halfway number is 61 higher than 30 and 61 lower than 152. Therefore, our halfway between answer of 91 above is correct.
Halfway Between
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Halfway Between 30 and 153
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