When you ask "What number is halfway between 1 and 309?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=1 and Y=309.
To find the number halfway between 1 and 309, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 1 and 309 into our formula, we get:
(1 + 309)/2 = 155
Thus, the number halfway between 1 and 309 is 155.
To check that our answer is correct, we subtract 1 from 155 and subtract 155 from 309 and compare the two numbers:
155 - 1 = 154
309 - 155 = 154
As you can see, the halfway number is 154 higher than 1 and 154 lower than 309. Therefore, our halfway between answer of 155 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 1 and 310
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