When you ask "What number is halfway between 100 and 945?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=945.
To find the number halfway between 100 and 945, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 945 into our formula, we get:
(100 + 945)/2 = 522.5
Thus, the number halfway between 100 and 945 is 522.5.
To check that our answer is correct, we subtract 100 from 522.5 and subtract 522.5 from 945 and compare the two numbers:
522.5 - 100 = 422.5
945 - 522.5 = 422.5
As you can see, the halfway number is 422.5 higher than 100 and 422.5 lower than 945. Therefore, our halfway between answer of 522.5 above is correct.
Halfway Between
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Halfway Between 100 and 946
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