24. Henry has 9 marbles. Sam has 6 times as many as Henry. Sam has marbles. 25. Dan is paid 8 cents for cleaning each rug. How much will he receive if he cleans 7 rugs? 26. Hugh can weed a row of beets 4 feet long in an hour. At the same rate how long a row could he weed in 7 hours? 27. If eggs cost 6 cents apiece, how much will a half dozen eggs cost? Review of Multiplication with One-Figure Numbers Multiply 749 by 8. 749 8 5992 Product Explain how we get each WRITTEN WORK Write the products only, without copying the examples: 1. 325 4. 248 7. 376 10. 693 13. 572 16. 4367 2 14. 396 17. 1537 8 4 6 5 9. 765 6 7 12. 389 15. 764 18. 1025 4 Multiplication: Two-Figure and Three-Figure Multipliers (b) Check example (a) by multiplying 45 by 397; that is, by using the multiplicand as the multiplier. 45 397 315 405 135 17865 The multiplier and the multiplicand are also called factors. So we may say that we may check multiplication by exchanging the factors. STANDARD TEST IN MULTIPLICATION Work 3 examples correctly in 2 minutes : (1) 807 (2) 780 (3) 806 (4) 606 (5) 960 Multiplication of United States Money Multiply $2.15 by 9. 1. How much will 7 books cost at $1.98 each? Find the cost of: 2. 7 baseballs at $1.30 each. 3. 9 fielder's gloves at $2.50 each. 4. 3 cather's mitts at $4.49 each. 5. 5 baseball bats at $1.10 each. 6. 5"Teddy bears" at $2.25 each. 7. 3 doll's houses at $6.75 each. 8. 7 yards of cloth at $1.15 a yard. 9. 5 doz. oranges at $.55 a dozen. 10. 8 doz. apples at 25¢ a dozen. 11. 7 composition books at 25¢ each. 12. 4 baseball bats at 75¢ each. 13. 2 pounds candy at 80¢ a pound. 14. 6 handkerchiefs at 15¢ apiece. 15. 8 tennis rackets at $7.77 apiece. More examples in multiplication of United States money are on page 391. |