1 / 11

Practice Problems for 5.2 and 5.3

Practice Problems for 5.2 and 5.3. Multiply 3.47 by 2.9. Steps! Take away the decimals. 347 * 29. Use the multiplication algorithm. 347 * 29 = 10063 Count the decimal places! 3.47 has 2 decimal places. 2.9 has 1 decimal place. Add the decimal places. 2 + 1 = 3.

Download Presentation

Practice Problems for 5.2 and 5.3

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Practice Problems for 5.2 and 5.3

  2. Multiply 3.47 by 2.9 • Steps! • Take away the decimals. • 347 * 29. • Use the multiplication algorithm. • 347 * 29 = 10063 • Count the decimal places! • 3.47 has 2 decimal places. • 2.9 has 1 decimal place. • Add the decimal places. • 2 + 1 = 3. • Move decimal places from the right. • 10063.0 becomes 10.063

  3. Multiply 49.9 by 7.35 • Steps! • Take away the decimals. • 499 * 735 • Use the multiplication algorithm. • 499 * 735 = 366765 • Count the decimal places! • 49.9 has 1 decimal place. • 7.35 has 2 decimal places. • Add the decimal places. • 1 + 2 = 3. • Move decimal places from the right. • 366765.0 becomes 366.765

  4. Multiply 6.251 by 52.4466 • Steps! • Take away the decimals. • 6251 *524466 • Use the multiplication algorithm. • 6251 *524466 = 3278436966 • Count the decimal places! • 6.251 has 3 decimal places. • 52.4466 has 4 decimal places. • Add the decimal places. • 3 + 4 = 7. • Move decimal places from the right. • 3278436966.0 becomes 327.8436966

  5. Write a story problem for 4.2 * 3.17 • Jenny put 4.2 gallons of gas into her pink Jeep. Each gallon costs $3.17. How much did she pay for gas?

  6. Write a story problem for 1.8 * 5.42 • Tommy went to FoodTown and bought 1.8 pounds of chicken. Each pound of chicken costs $5.42. How much did Tommy pay for chicken?

  7. Write a story problem for 16 * 2.28 • Marissa has 16 pairs of shoes. Each pair of shoes weights 2.28 pounds. How much do her shoes weigh in total?

  8. Fill in the blanks! a. A positive number * a positive number = a ________ number. b. A positive number * a negative number = a _________ number. c. A negative number * a positive number = a __________ number. d. A negative number * a negative number = a _________ number. • Answers a. Positive b. Negative c. Negative d. Positive

  9. What property explains why -4 * 6 = 6 * -4 • The commutative property of multiplication.

  10. What is -9 * 7 • Answer: -63 • Why? • 9 * 7 = 63 • One of the multiples is positive and the other is negative, therefore the solution is negative.

  11. What is -5 * -5 • Answer: 25 • Why? • 5*5 = 25 • Both of the multiples are negative; therefore the solution is positive.

More Related