When you ask "What number is halfway between 20 and 351?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=351.
To find the number halfway between 20 and 351, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 351 into our formula, we get:
(20 + 351)/2 = 185.5
Thus, the number halfway between 20 and 351 is 185.5.
To check that our answer is correct, we subtract 20 from 185.5 and subtract 185.5 from 351 and compare the two numbers:
185.5 - 20 = 165.5
351 - 185.5 = 165.5
As you can see, the halfway number is 165.5 higher than 20 and 165.5 lower than 351. Therefore, our halfway between answer of 185.5 above is correct.
Halfway Between
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Halfway Between 20 and 352
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