When you ask "What number is halfway between 51 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=51 and Y=428.
To find the number halfway between 51 and 428, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 428 into our formula, we get:
(51 + 428)/2 = 239.5
Thus, the number halfway between 51 and 428 is 239.5.
To check that our answer is correct, we subtract 51 from 239.5 and subtract 239.5 from 428 and compare the two numbers:
239.5 - 51 = 188.5
428 - 239.5 = 188.5
As you can see, the halfway number is 188.5 higher than 51 and 188.5 lower than 428. Therefore, our halfway between answer of 239.5 above is correct.
Halfway Between
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Halfway Between 51 and 429
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