Lesson 5

Hour Walk

Est. Class Sessions: 1–2

Daily Practice and Problems

Teacher Notes
X

TIMS Task

  1. 42
  2. 420
  3. Answers will vary. Each piece is exchanged for a piece that is ten times greater than itself. For example, 42 (4 skinnies and 2 bits) when multiplied by 10 changes to 420 (4 flats and 2 skinnies). Students explored patterns in multiplying by 10 and multiples of 10 in Lesson 2. Investigating such patterns will help students discover more efficient ways of solving problems such as 12 × 20, 23 × 40, 22 × 400.

P. Multiples of 10

  1. What number is represented here in base-ten shorthand? One bit represents one whole.
    2. 
  1. Multiply the number by 10 and record the answer in base-ten shorthand.
  2. How do base-ten pieces change when you multiply a number by 10?