Lesson 5

Angles in Polygons

Est. Class Sessions: 3

Daily Practice and Problems

Teacher Notes
X

TIMS Task

Refer students to the Addition and Subtraction Strategies Menu in the Student Guide Reference section.

    1. 8325
    2. 30,000
    3. 3256
    4. 2538
    5. 378
    6. 190
    7. 403
    8. 2437
  2. Strategies will vary. Students can use a counting-up strategy to subtract for Question 1D.

    462 + 8 = 470;

    470 + 30 = 500;

    500 + 2500 = 3000;

    8 + 30 + 2500 = 2538.
  3. Strategies will vary. For Question D:

    3000 − 500 = 2500

L. Add, Subtract, and Multiply

Solve the following problems using paper and pencil or mental math. Be sure to estimate to see if your answers are reasonable.

    1. 7980 + 345 =
    2. 60 × 500 =
    3. 4021 − 765 =
    4. 3000 − 462 =
    5. 42 × 9 =
    6. 38 × 5 =
    7. 578 − 175 =
    8. 2031 + 406 =
  2. Choose one problem in Question 1 and explain how you can solve it using mental math.
  3. Choose one problem in Question 1 and show or tell how you know your answer is reasonable.