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EnVision Math Topic 2: Lesson 2-2 Estimating Sums and Differences 2010-11

EnVision Math Topic 2: Lesson 2-2 Estimating Sums and Differences 2010-11. Rocket Math. Rocket Math Partners. Ryan and Ariana Chelsie and Allison Maryan and Brandon Saul and Jayla Meadow and Mikayla Cameron, Jadyn & Ryan V.

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EnVision Math Topic 2: Lesson 2-2 Estimating Sums and Differences 2010-11

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  1. EnVision Math Topic 2: Lesson 2-2 Estimating Sums and Differences 2010-11

  2. Rocket Math

  3. Rocket Math Partners Ryan and Ariana Chelsie and Allison Maryan and Brandon Saul and Jayla Meadow and Mikayla Cameron, Jadyn & Ryan V. Matthew and Nicholas Elijah and Chase

  4. How can I estimate sums and differences?

  5. 600 300 645 + 253 = 900

  6. 400 100 398 + 121 = 500

  7. 600 400 563 + 375 = 1,000

  8. 5,000 2,000 5,317 + 1,734 = 7,000

  9. 6,000 4,000 6,324 + 3,842 = 10,000

  10. 70,000 20,000 72,694 + 17,789 = 90,000

  11. 1,300 200 1,250 + 204 = 1,500

  12. 540 30 542 + 27 = 570

  13. 300 200 288 - 171 = 100

  14. 5,000 3,000 5,323 – 2,611 = 2,000

  15. 70,000 40,000 73,088 – 44,444 = 30,000

  16. 40 890 892 - 35 = 850

  17. 1,700 700 1,724 - 731 = 1,000

  18. 2,000 2,000 1,931 – 1,884 = 0

  19. 1,900 1,900 1,931 – 1,884 = 0

  20. 1,930 1,880 1,931 – 1,884 = 50

  21. How can I estimate sums and differences?

  22. $5.00 $8.00 $4.95 + $8.39 = $13.00

  23. $9.00 $7.00 $9.45 - $6.72 = $2.00

  24. $20.00 $70.00 $24.66 + $72.19 = $90.00

  25. Let’s Practice!

  26. 200 500 219 + 544 = 700

  27. 90,000 30,000 86,128 – 28,017 = 60,000

  28. $9.00 $9.00 $8.79 + $9.13 = $18.00

  29. 1,600 900 1,576 - 910 = 700

  30. 7,000 6,000 7,299 + 5,846 = 13,000

  31. 8,000 2,000 8,112 – 1,511 = 6,000

  32. 1,400 300 1,415 + 337 = 1,700

  33. $80.00 $30.00 $78.50 - $31.99 = $50.00

  34. 80,000 60,000 84,735 + 58,175 = 140,000

  35. This year, 35,658 people ran in a marathon. Last year, 8,683 fewer people ran. About how many people ran last year? 36,000 9,000 35,658 – 8,683 = 27,000 people

  36. There are 152 students in grade 4 and 144 students in grade 5. About how many students are in grade 4 and 5? 200 100 152 + 144 = 300 students

  37. Alex sold 86 tickets to a school talent show on Thursday and 103 tickets on Friday. About how many tickets did Alex sell altogether? 90 100 86 + 103 = 190 tickets

  38. 500 + 900 = 1,400 Estimate 463 + 896. The sum is between which two numbers? A. 500 and 1,000 B. 1,000 and 1,500 C. 1,500 and 2,000 D. 2,000 and 2,500

  39. 1,000 + 800 = 1,800 Estimate 963 + 751. The sum is between which two numbers? A. 500 and 1,000 B. 1,000 and 1,500 C. 1,500 and 2,000 D. 2,000 and 2,500

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