When you ask "What number is halfway between 21 and 898?" 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=898.
To find the number halfway between 21 and 898, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 898 into our formula, we get:
(21 + 898)/2 = 459.5
Thus, the number halfway between 21 and 898 is 459.5.
To check that our answer is correct, we subtract 21 from 459.5 and subtract 459.5 from 898 and compare the two numbers:
459.5 - 21 = 438.5
898 - 459.5 = 438.5
As you can see, the halfway number is 438.5 higher than 21 and 438.5 lower than 898. Therefore, our halfway between answer of 459.5 above is correct.
Halfway Between
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Halfway Between 21 and 899
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