Lesson 2

All-Partials Revisited

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

TIMS Task

Refer students to the Multiplication Strategies Menu for Larger Numbers in the Student Guide Reference section.

    1. 162
    2. 3180
    3. 1314
    4. 5568

  2. Possible estimation strategy for 1A: Six quarters is $1.50, so 6 × 27 will be a little more than 150.

  3. Possible solution strategy for 1A: 6 quarters is $1.50, so 6 × 25 = 150, 2 × 6 = 12, 150 + 12 = 162.

    Possible solution strategy for 1B: 4 × 800 = 3200; 795 = 800 − 5; 4 × 5 = 20; 3200 − 20 = 3180

H. Multiplication

Solve the following problems using a paper-and-pencil method or mental math. Estimate to make sure your answers are reasonable.

    1. 27 × 6 =
    2. 795 × 4 =
    3. 18 × 73 =
    4. 64 × 87 =
  1. Explain your estimation strategy for Question 1A.
  2. Choose a problem and explain how to solve it with mental math or a few quick notes.