When you ask "What number is halfway between 7 and 147?" 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=147.
To find the number halfway between 7 and 147, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 147 into our formula, we get:
(7 + 147)/2 = 77
Thus, the number halfway between 7 and 147 is 77.
To check that our answer is correct, we subtract 7 from 77 and subtract 77 from 147 and compare the two numbers:
77 - 7 = 70
147 - 77 = 70
As you can see, the halfway number is 70 higher than 7 and 70 lower than 147. Therefore, our halfway between answer of 77 above is correct.
Halfway Between
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Halfway Between 7 and 148
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