When you ask "What number is halfway between 55 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=55 and Y=351.
To find the number halfway between 55 and 351, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 351 into our formula, we get:
(55 + 351)/2 = 203
Thus, the number halfway between 55 and 351 is 203.
To check that our answer is correct, we subtract 55 from 203 and subtract 203 from 351 and compare the two numbers:
203 - 55 = 148
351 - 203 = 148
As you can see, the halfway number is 148 higher than 55 and 148 lower than 351. Therefore, our halfway between answer of 203 above is correct.
Halfway Between
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Halfway Between 55 and 352
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