When you ask "What number is halfway between 7 and 428?" 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=428.
To find the number halfway between 7 and 428, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 428 into our formula, we get:
(7 + 428)/2 = 217.5
Thus, the number halfway between 7 and 428 is 217.5.
To check that our answer is correct, we subtract 7 from 217.5 and subtract 217.5 from 428 and compare the two numbers:
217.5 - 7 = 210.5
428 - 217.5 = 210.5
As you can see, the halfway number is 210.5 higher than 7 and 210.5 lower than 428. Therefore, our halfway between answer of 217.5 above is correct.
Halfway Between
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Halfway Between 7 and 429
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