When you ask "What number is halfway between 66 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=66 and Y=147.
To find the number halfway between 66 and 147, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 147 into our formula, we get:
(66 + 147)/2 = 106.5
Thus, the number halfway between 66 and 147 is 106.5.
To check that our answer is correct, we subtract 66 from 106.5 and subtract 106.5 from 147 and compare the two numbers:
106.5 - 66 = 40.5
147 - 106.5 = 40.5
As you can see, the halfway number is 40.5 higher than 66 and 40.5 lower than 147. Therefore, our halfway between answer of 106.5 above is correct.
Halfway Between
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Halfway Between 66 and 148
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