When you ask "What number is halfway between 5 and 151?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=5 and Y=151.
To find the number halfway between 5 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 151 into our formula, we get:
(5 + 151)/2 = 78
Thus, the number halfway between 5 and 151 is 78.
To check that our answer is correct, we subtract 5 from 78 and subtract 78 from 151 and compare the two numbers:
78 - 5 = 73
151 - 78 = 73
As you can see, the halfway number is 73 higher than 5 and 73 lower than 151. Therefore, our halfway between answer of 78 above is correct.
Halfway Between
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Halfway Between 5 and 152
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