Model and describe collections of objects as 'groups of'

1. Circus Times: 3 rows of monkeys x 3 per row
2. Circus Times: 2 rows of clowns x 3 per row
3. Counter Times: 3 groups of ?. There are 12 altogether.
4. Counter Times: 3 groups of ?. There are 9 altogether.
5. Counter Times: 3 groups of ?. There are 15 altogether.