When you ask "What number is halfway between 21 and 297?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=297.
To find the number halfway between 21 and 297, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 297 into our formula, we get:
(21 + 297)/2 = 159
Thus, the number halfway between 21 and 297 is 159.
To check that our answer is correct, we subtract 21 from 159 and subtract 159 from 297 and compare the two numbers:
159 - 21 = 138
297 - 159 = 138
As you can see, the halfway number is 138 higher than 21 and 138 lower than 297. Therefore, our halfway between answer of 159 above is correct.
Halfway Between
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Halfway Between 21 and 298
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