In this particular example, it does not matter whether you round first or last. The answer is 1.
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Whole numbers are known as zero plus the "counting numbers." (1, 2, 3, ...) So, the whole numbers of 21 would be 0 - 21. (23 numbers.)
To add 0.889, 0.32, and 0.0033, you simply add the numbers together: 0.889 + 0.32 + 0.0033 = 1.2123. Rounding to the nearest hundred would mean rounding to two decimal places, so the result would be 1.21.
Rounding both numbers to the nearest ten it is about 80
The whole numbers include the counting numbers, plus zero.
It is 5 + 4 = 9.