PARTS OF NATURAL NUMBERS 2 PROBLEMS (2) To see the answer, pass your mouse over the colored area. 17. In each column, calculate half of each number mentally.
18. Calculate half mentally.
19. a) Two and a half times $9.00 = $18.00 + $4.50 = $22.50 19. b) Three and a half times $7.00? = $24.50 19. c) Four and a half times $11.00? = $49.50 19. d) Six and a half times $5.00? = $32.50 20. How much is a fourth or a quarter of these? (Take half of half. What
21. How much is 25% of these?
22. Multiplying by 5. Take half the multiplication by 10.
23. Multiplying by 15. 13. a) 15 × 12 = 180 b) 15 × 16 = 240 18. c) 15 × 24 = 360 d) 15 × 46 = 690 24. How much is 15% of these? 19. a) $20 $3 b) $30 $4.50 c) $18 $2.70 19. d) $40 $6 e) $60 $9 f) $70 $10.50 Increase or decrease by a part 25 A photograph measures 9 inches by 12 inches. If it will be enlarged 12 inches by 16 inches 26. In 1990, the population was 30,000. By the year 2000, the population 36,000 27. Last week a blouse cost $35. This week the price was reduced by a 28. Janet used to earn $28,000 a year. In her new job, she makes one Continue on to the next Lesson. or Return to the previous section. Please make a donation to keep TheMathPage online. Copyright © 2001-2007 Lawrence Spector Questions or comments? E-mail: themathpage@nyc.rr.com |