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EnVision Math Topic 5: Lesson 5-3 & 5-4 Combined Multiplying by 1-Digit Numbers:

EnVision Math Topic 5: Lesson 5-3 & 5-4 Combined Multiplying by 1-Digit Numbers: Using Rounding to Estimate 2010-11. Sarah earns $48 a week babysitting. She has saved all her money for the past 6 weeks. About how much money has she earned?. About.

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EnVision Math Topic 5: Lesson 5-3 & 5-4 Combined Multiplying by 1-Digit Numbers:

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  1. EnVision Math Topic 5: Lesson 5-3 & 5-4 Combined Multiplying by 1-Digit Numbers: Using Rounding to Estimate 2010-11

  2. Sarah earns $48 a week babysitting. She has saved all her money for the past 6 weeks. About how much money has she earned? About

  3. How can I estimate products?

  4. 600 300 645 + 253 = 900

  5. 70,000 20,000 72,694 - 17,789 = 50,000

  6. 50 x 9 52 x 9 = 450

  7. 6 x 30 6 x 34 = 180

  8. 300 x 7 314 x 7 = 2,100

  9. 3 x 500 3 x 538 = 1,500

  10. 40 x 5 39 x 5 = 200

  11. 9 x 600 9 x 602 = 5,400

  12. 3 x 90 3 x 86 = 270

  13. 500 x 7 486 x 7 = 3,500

  14. 80 x 8 77 x 8 = 640

  15. 2 x 900 2 x 863 = 1,800

  16. 4,000 x 9 3,752 x 9 = 36,000

  17. 7 x 6,000 7 x 5,835 = 42,000

  18. 7,000 x 8 6,987 x 8 = 56,000

  19. 4 x 5,000 4 x 5,125 = 20,000

  20. Sarah earns $48 a week babysitting. She has saved all her money for the past 6 weeks. About how much money has she earned? 50 x 6 = $300

  21. There are 78 fifth grade students at Lincoln Elementary. Each fifth grader brought in 7 cans for the recycling drive. About how many cans did the fifth graders collect? 80 x 7 = 560 cans

  22. Ursula has an album that she keeps pressed flowers in. The album has 34 pages, and each page has 7 pressed flowers. Which of the following shows a reasonable estimate for how many pressed flowers Ursula has? • 40 x 7 = 280 pressed flowers • 30 x 7 = 210 presses flowers • 40 x 10 = 400 pressed flowers • 30 x 10 = 300 pressed flowers

  23. Isabelle has 9 ant farms. Each ant farm has 99 ants. Which of the following is a reasonable estimate of how many ants Isabelle has? • 9 x 90 = 810 ants • 10 x 100 = 1,000 ants • 9 x 80 = 720 ants • 9 x 100 = 900 ants

  24. How can I use estimation to check if my answer is reasonable?

  25. There are 5 animals on a farm. Each animal eats 105 pounds of food per week. How much food does the farmer have to buy each week? 105 x 5 = 525 pounds of food 100 x 5 = 500

  26. Kenny has 7 pouches. Each pouch has 21 marbles. How many marbles does Kenny have? 147 pouches 7 x 21 = marbles 7 x 20 = 140

  27. A fish store has 3 empty tanks. After a delivery, they put 29 fish in each tank. How many fish were in the delivery? 3 x 29 = 627 fish 87 3 x 30 = 90

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