When you ask "What number is halfway between 51 and 128?" 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=128.
To find the number halfway between 51 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 128 into our formula, we get:
(51 + 128)/2 = 89.5
Thus, the number halfway between 51 and 128 is 89.5.
To check that our answer is correct, we subtract 51 from 89.5 and subtract 89.5 from 128 and compare the two numbers:
89.5 - 51 = 38.5
128 - 89.5 = 38.5
As you can see, the halfway number is 38.5 higher than 51 and 38.5 lower than 128. Therefore, our halfway between answer of 89.5 above is correct.
Halfway Between
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Halfway Between 51 and 129
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