When you ask "What number is halfway between 51 and 438?" 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=438.
To find the number halfway between 51 and 438, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 438 into our formula, we get:
(51 + 438)/2 = 244.5
Thus, the number halfway between 51 and 438 is 244.5.
To check that our answer is correct, we subtract 51 from 244.5 and subtract 244.5 from 438 and compare the two numbers:
244.5 - 51 = 193.5
438 - 244.5 = 193.5
As you can see, the halfway number is 193.5 higher than 51 and 193.5 lower than 438. Therefore, our halfway between answer of 244.5 above is correct.
Halfway Between
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Halfway Between 51 and 439
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