1 / 46

8 th Grade Math

8 th Grade Math. 1 st Period Nov . 5, 2012. You have 7 min. to complete your Do Now! Quiz. You MUST show your work You may use a calculator You may use your notes You may NOT talk. HW Review on 11-7 PowerPoint. Warm-Up.

cady
Download Presentation

8 th Grade Math

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. 8th Grade Math 1st Period Nov. 5, 2012

  2. You have 7 min.to complete your Do Now! Quiz • You MUST show your work • You may use a calculator • You may use your notes • You may NOT talk

  3. HW Review on 11-7 PowerPoint

  4. Warm-Up At Emmit’s Evergreen Farm, the taller trees are braced by wires. A wire extends from 2 feet below the top of a tree to a stake in the ground. What is the tallest tree that can be braced with a 25-foot wire staked 15 feet from the base of the tree?

  5. Warm-Up: Answer At Emmit’s Evergreen Farm, the taller trees are braced by wires. A wire extends from 2 feet below the top of a tree to a stake in the ground. What is the tallest tree that can be braced with a 25-foot wire staked 15 feet from the base of the tree? 18 ft

  6. Using The Pythagorean Theorem In Word Problems Back of WS #2 – Problem #8: What is the length of the diagonal of a 10 cm by 15 cm rectangle? Draw a picture: x 10 15

  7. Looking for length of the hypotenuse a2 + b2 = c2 102 + 152 = x2 100 + 225 = x2 325 = x2 The diagonal of a 10 cm by 15 cm rectangle is approx. 18.028 cm. Using the Pythagorean Theorem x 10 15

  8. Using The Pythagorean Theorem In Word Problems Back of WS #2 – Problem #9: The diagonal of a rectangle is 25 in. The width is 15 in. What is the length? Draw a picture: 25 X 15

  9. Looking for length of a leg a2 + b2 = c2 x2 + 152 = 252 x2 + 225 = 625 -225-225 x2 = 400 x = 20 The length of the rectangle is 20 in. Using the Pythagorean Theorem 25 X 15

  10. You Try! Back of WS #2 – Problems #10-15 • For Problem #15, fill in the following picture:

  11. HW • Back of WS #2 – Problems #10-15 • Front of WS #2 – Problems #1-7 (if you haven’t completed it already) • Tomorrow’s Do Now! Quiz will have: • Four Pythagorean Theorem word problems

  12. 8th Grade Math 2nd Period Only Nov. 5, 2012

  13. You have 7 min.to complete your Do Now! Quiz • You MUST show your work • You may use a calculator • You may use your notes • You may NOT talk

  14. HW Review on 11-7 PowerPoint

  15. No Warm-Up

  16. Using The Pythagorean Theorem In Word Problems Back of WS #2 – Problem #8: What is the length of the diagonal of a 10 cm by 15 cm rectangle? Draw a picture: x 10 15

  17. Looking for length of the hypotenuse a2 + b2 = c2 102 + 152 = x2 100 + 225 = x2 325 = x2 The diagonal of a 10 cm by 15 cm rectangle is approx. 18.028 cm. Using the Pythagorean Theorem x 10 15

  18. Using The Pythagorean Theorem In Word Problems Back of WS #2 – Problem #9: The diagonal of a rectangle is 25 in. The width is 15 in. What is the length? Draw a picture: 25 X 15

  19. Looking for length of a leg a2 + b2 = c2 x2 + 152 = 252 x2 + 225 = 625 -225-225 x2 = 400 x = 20 The length of the rectangle is 20 in. Using the Pythagorean Theorem 25 X 15

  20. You Try! Back of WS #2 – Problems #10-15 • For Problem #15, fill in the following picture:

  21. Remediation: Using Square Roots & Cube Roots to Solve Equations Solve . • Option 1: Think, “What squared gives me 64?” • Remember: Squaring is multiplying something by itself 2 times. For example, . • Option 2: Think, “x is being squared; how do I undo squaring?” • Either way, the answer is .

  22. Remediation: Using Square Roots & Cube Roots to Solve Equations Solve . • Option 1: Think, “What squared gives me 35?” • However, you can’t square a whole number or a fraction to give you 35. • Use Option 2 instead. • Option 2: Think, “x is being squared; how do I undo squaring?” • The answer is .

  23. FYI Unless the problems says otherwise: • You may leave irrational answers as square roots in traditional Pythagorean Theorem problems (not word problems). • You should give numerical approximations of irrational answers in Pythagorean Theorem word problems; round to the number of decimal places specified in the directions.

  24. Remediation: Using Square Roots & Cube Roots to Solve Equations Solve . • Option 1: Think, “What cubed gives me 64?” • Remember: Cubing is multiplying something by itself 3 times. For example, . • Option 2: Think, “x is being cubed; how do I undo cubing?” • Either way, the answer is .

  25. Remediation: Using Square Roots & Cube Roots to Solve Equations Solve . • Option 1: Think, “What cubed gives me 20?” • However, you can’t cube a whole number or a fraction to give you 20. • Use Option 2 instead. • Option 2: Think, “x is being cubed; how do I undo cubing?” • The answer is .

  26. HW • Back of WS #2 – Problems #10-15 • Front of WS #2 – Problems #1-7 (if you haven’t completed it already) • Tomorrow’s Do Now! Quiz will have: • Two equations you need to solve by square rooting or cube rooting • Two Pythagorean Theorem word problems

  27. 8th Grade Math 4th Period Nov. 5, 2012

  28. You have 7 min.to complete your Do Now! Quiz • You MUST show your work • You may use a calculator • You may use your notes • You may NOT talk

  29. HW Review on 11-7 PowerPoint

  30. Warm-Up At Emmit’s Evergreen Farm, the taller trees are braced by wires. A wire extends from 2 feet below the top of a tree to a stake in the ground. What is the tallest tree that can be braced with a 25-foot wire staked 15 feet from the base of the tree?

  31. Warm-Up: Answer At Emmit’s Evergreen Farm, the taller trees are braced by wires. A wire extends from 2 feet below the top of a tree to a stake in the ground. What is the tallest tree that can be braced with a 25-foot wire staked 15 feet from the base of the tree? 18 ft

  32. Using The Pythagorean Theorem In Word Problems Back of WS #2 – Problem #8: What is the length of the diagonal of a 10 cm by 15 cm rectangle? Draw a picture: x 10 15

  33. Looking for length of the hypotenuse a2 + b2 = c2 102 + 152 = x2 100 + 225 = x2 325 = x2 The diagonal of a 10 cm by 15 cm rectangle is approx. 18.028 cm. Using the Pythagorean Theorem x 10 15

  34. Using The Pythagorean Theorem In Word Problems Back of WS #2 – Problem #9: The diagonal of a rectangle is 25 in. The width is 15 in. What is the length? Draw a picture: 25 X 15

  35. Looking for length of a leg a2 + b2 = c2 x2 + 152 = 252 x2 + 225 = 625 -225-225 x2 = 400 x = 20 The length of the rectangle is 20 in. Using the Pythagorean Theorem 25 X 15

  36. You Try! Back of WS #2 – Problems #10-15 • For Problem #15, fill in the following picture:

  37. HW • Back of WS #2 – Problems #10-15 • Front of WS #2 – Problems #1-7 (if you haven’t completed it already) • Tomorrow’s Do Now! Quiz will have: • Four Pythagorean Theorem word problems

  38. Common Core Math I 5th Period Nov. 5, 2012

  39. HW Review:How to Estimate a Line of Best Fit • Sketch a straight line that runs as close to as many data points as possible. • Estimate the coordinates of two points on your line, and use them to write your line’s rule (y = mx + b form). • (0, 0) and (6, 2) • (0, 0)  b = 0

  40. HW Review: Practice • Sketch a straight line that runs as close to as many data points as possible. • Estimate the coordinates of two points on your line, and use them to write your line’s rule (y = mx + b form). • (0, 50) and (800, 150) • (0, 50)  b = 50

  41. No Warm-Up

  42. Notes: Using Linear Models to Predict Given that your best fit line is : • What shadow location would you predict when the flag height is 12 feet? 25 feet? • Graphical answers (see right) • Algebraic answers:

  43. Notes: Using Linear Models to Predict Given that your best fit line is : • What flag height would locate the flag shadow 6.5 feet from the base of the pole? 10 feet from the base of the pole? • Graphical answers (see right) • Algebraic answers: 19.5 = x • 30 = x

  44. Practice:Using Linear Models to Predict Given that your best fit line is : • Predict the flight time for westbound flights 1200 miles in distance. • Predict the distance for westbound flights with 12 hours of flight time.

  45. Practice:Using Linear Models to Predict Given that your best fit line is : • Use your rule to predict the flight time for westbound flights 1200 miles in distance. • Use your rule to predict the distance for westbound flights with 12 hours of flight time. •  x = 5360

  46. CW/HW • CW: "CW/HW: Using Linear Models to Predict"

More Related