Question

What is the difference between the successor of the greatest 3-digit number and the predecessor of the least
2-digit number?
[5 marks]

Answer 1

Let's first write the greatset 3-digit number.
The greatest 3-digit number is 999.
[1 mark]

The successor of 999 is 999 + 1, that is, 1000.
[1 mark]

Now, the least 2-digit number is 10.
[1 mark]

The predecessor of 10 is 10 - 1, that is, 9.
[1 mark]

Now we have to find the difference between 1000 and 9.
So, 1000 - 9 = 991
So, 991 is the answer.
[1 mark]