1. Find the product.3 × 8 A. 5 B. 11 C. 24 D. 38 Hint 2. Find the sum. A. 15,145 B. 20,879 C. 19,799 D. 19,769 Hint 3. Use mental multiplication. 3 × 400 A. 1,200 B. 12,000 C. 120 D. 3,400 Hint 4. Use mental multiplication.100 × 24 A. 24,000 B. 2,400 C. 124 D. 240 Hint 5. Tell which equation represents a way to find the product of 4 × 31. A. 4 × (30 + 1) B. 4 × (30 − 1) C. 4 × (4 + 31) D. 4 × (31 − 1) Hint 6. Find the product of 8 × 14 using mental math. A. 112 B. 122 C. 84 D. 94 Hint 7. Tell which equation is an estimate for A. 50 × 10 = 500 B. 60 × 10 = 600 C. 50 × 20 = 1,000 D. 50 + 10 = 60 Hint 8. An athlete exercises for 78 minutes every day. Tell which equation can be used to estimate how long the athlete exercises in one week. A. 80 + 7 = 87 B. 80 × 7 = 560 C. 70 × 10 = 700 D. 100 ×7 = 700 Hint 9. Find the product. A. 169 B. 159 C. 56 D. 533 Hint 10. Find 7 × 52. A. 364 B. 752 C. 59 D. 354 Hint 11. Find 78 × 23. A. 1,424 B. 1,794 C. 7,823 D. 101 Hint 12. As part of her training, an athlete runs 11 kilometers each day. How many kilometers does she run in 24 days? A. 242 km B. 2,640 km C. 64 km D. 264 km Hint 13. Identify the property.(6 × 9) × 15 = 6 × (9 × 15) A. Distributive Property B. Identity Property C. Commutative Property D. Associative Property Hint 14. Find the product mentally.5 × 13 × 200 A. 218 B. 3,600 C. 513,200 D. 13,000 Hint 15. Tell which equation is an estimate for 3 × \$5.05. A. \$5 × 5 = \$25 B. \$5 × 15 = \$75 C. 3 × \$5 = \$15 D. 3 + \$5 = \$8 Hint 16. Tell which equation is an estimate for 6 × \$7.89. A. 6 × \$8 = \$48 B. 6 + \$8 = \$14 C. 5 × \$5 = \$25 D. 10 × \$10 = \$100 Hint