When you ask "What number is halfway between 7 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=7 and Y=151.
To find the number halfway between 7 and 151, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 151 into our formula, we get:
(7 + 151)/2 = 79
Thus, the number halfway between 7 and 151 is 79.
To check that our answer is correct, we subtract 7 from 79 and subtract 79 from 151 and compare the two numbers:
79 - 7 = 72
151 - 79 = 72
As you can see, the halfway number is 72 higher than 7 and 72 lower than 151. Therefore, our halfway between answer of 79 above is correct.
Halfway Between
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Halfway Between 7 and 152
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