When you ask "What number is halfway between 79 and 900?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=79 and Y=900.
To find the number halfway between 79 and 900, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 79 and 900 into our formula, we get:
(79 + 900)/2 = 489.5
Thus, the number halfway between 79 and 900 is 489.5.
To check that our answer is correct, we subtract 79 from 489.5 and subtract 489.5 from 900 and compare the two numbers:
489.5 - 79 = 410.5
900 - 489.5 = 410.5
As you can see, the halfway number is 410.5 higher than 79 and 410.5 lower than 900. Therefore, our halfway between answer of 489.5 above is correct.
Halfway Between
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