When you ask "What number is halfway between 51 and 219?" 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=219.
To find the number halfway between 51 and 219, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 219 into our formula, we get:
(51 + 219)/2 = 135
Thus, the number halfway between 51 and 219 is 135.
To check that our answer is correct, we subtract 51 from 135 and subtract 135 from 219 and compare the two numbers:
135 - 51 = 84
219 - 135 = 84
As you can see, the halfway number is 84 higher than 51 and 84 lower than 219. Therefore, our halfway between answer of 135 above is correct.
Halfway Between
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Halfway Between 51 and 220
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