Lesson 3

Multiplying by Multiples of Ten

Est. Class Sessions: 1–2

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

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

  1. 237; A possible mental math strategy:
    (80 × 3) − (1 × 3) = 240 − 3 = 237.
  2. 312; A possible mental math strategy:
    (50 × 6) + (2 × 6) = 300 + 12 = 312.

I. Multiplication

Solve the problems two ways. Use a paper-and-pencil method and a mental math strategy for each. Explain your mental math strategy for one problem.

  1. 79 × 3
  2. 52 × 6