5. Simple multiplication: 12 * 4 = 48 books in total
6. Simple multiplication: 29 * 4 = 116 cards in total
7. You could turn 5 * 198 into (5 * 200) - (5 * 10) using the Distributive Property and use mental math to solve
8. subtraction, multiplication
9. Simple multiplication: 5 * 78 = $3.90, so C