Answer briefly. 1. List the whole numbers. that round off to 80. a. What is the greatest whole number that rounds off to 80? b. What is the least whole number that rounds off to 80? 2. List down five whole numbers that round off to 500. à. What is the greatest whole number that rounds off to 500? b. What is the least whole number that rounds off to 500? 3. List down five whole numbers that round off to 1000 a. What is the greatest whole number that rounds off to 1000? b. What is the least whole number that rounds off to 1000? 4. List down five whole numbers that round off to 60 000. a. What is the greatest whole number that rounds off to 60 000? b. What is the least whole number that rounds off to 60 000? >