1. Make 21¢ with 3 coins. Dime, Dime, Penny

2. Make 21¢ with 4 coins. Dime, Nickel, Nickel, Penny

3. Make 21¢ with 5 coins. Nickel, Nickel, Nickel, Nickel, Penny

4. Make 51¢ with 3 coins. Quarter, Quarter, Penny

5. Make 51¢ with 6 coins. Dime, Dime, Dime, Dime, Dime, Dime, Penny

6. Make 51¢ with 5 coins. Quarter, Dime, Dime, Nickel, Penny