What is the number next to the greatest four digit number for Advance math

10000 is the number which is next to the greatest four digit number i. e. 9999.

Step-by-step explanation:

The smallest 4-digit number = 1000 The greatest 4-digit number = 9999

So,

Adding 1 to greatest 4-digit number i. e. 9999 would bring the number 10000.

i. e. 1 + 9999 = 10000

Note that 10000 is the smallest 5-digit number which is obtained when we add 1 the greatest four digit number (9999).

Therefore, 10000 is the number which is next to the greatest four digit number.