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992

It is 99,887,765

9876543

That is correct. Considering the largest double digit whole number is 99. Unless of course, you mean adding the two digits of a double digit number alongside the two digits of another double digit number, then yes, you will have a 4 digit number. Depends how you interpret the question, and your creativity.

Three digits can't possibly add up to 900. The largest possible sum of 3 digits is (9 + 9 + 9) = 27.

The number of digits increases - without limit.

804

999,999 is 6 digits Adding 1 makes it 1,000,000 = a 7 digit number.

A quintillion is a number with 18 zeros (19 digits). A 20-digit number would be 10's of a quintillion (20 digits since we add one more digit to the left).

Two-digit prime numbers whose digits add up to 10 are:193773

No. There's no two digit numbers that could do this. The largest two digit number is 99. If you add 99 to itself, you only get 198, which is much smaller than a four digit number.

zero is used in the number system as a digit and a add on to other digits

67

22

585

44

33 is a two-digit number whose digits add up to 6. 60, 51, 42, 24, 15

537

Add the least significant digits (carry any thing greater than the base)Add the carry and the next least most significant digits, (carry anything greater than the base)Add the third most significant digits, (carry anything greater than the base)Add the carry to the most significant digit.Done

-- List the digits that are used to write the number. -- Add up the list.

The number is 85.

9999 is the largest 4-digit number.When added with 1 it becomes 10000. 9999 + 1 = 10000.

99990 Note that if you add 11 to my answer you get a 6-digit number therefore it must be the largest 5-digit whole multiple of 11.

23 or 41

10