When you ask "What number is halfway between 3 and 153?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=3 and Y=153.
To find the number halfway between 3 and 153, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 153 into our formula, we get:
(3 + 153)/2 = 78
Thus, the number halfway between 3 and 153 is 78.
To check that our answer is correct, we subtract 3 from 78 and subtract 78 from 153 and compare the two numbers:
78 - 3 = 75
153 - 78 = 75
As you can see, the halfway number is 75 higher than 3 and 75 lower than 153. Therefore, our halfway between answer of 78 above is correct.
Halfway Between
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Halfway Between 3 and 154
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