When you ask "What number is halfway between 51 and 205?" 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=205.
To find the number halfway between 51 and 205, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 205 into our formula, we get:
(51 + 205)/2 = 128
Thus, the number halfway between 51 and 205 is 128.
To check that our answer is correct, we subtract 51 from 128 and subtract 128 from 205 and compare the two numbers:
128 - 51 = 77
205 - 128 = 77
As you can see, the halfway number is 77 higher than 51 and 77 lower than 205. Therefore, our halfway between answer of 128 above is correct.
Halfway Between
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Halfway Between 51 and 206
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