Unit 4Weeks 19–24

Signals and shared decisions

We send messages with sound and light, and learn how groups make fair decisions.

Start Week 19

Children test sound and light with a string phone, a flashlight and a box. Below, neighbors vote around a table in a community room.

My passport

Unit 4 stamps

Finish a week’s game to earn its stamp.

  1. Week 19, not stamped yet
  2. Week 20, not stamped yet
  3. Week 21, not stamped yet
  4. Week 22, not stamped yet
  5. Week 23, not stamped yet
  6. Week 24, not stamped yet

Grade 1 lessons in this unit

Lesson numbers and pages match your Grade 1 books. Each lesson opens its part of the week page.

Social StudiesGrade 1 Social Studies book

  1. Lesson 13: A place for everyoneBook p. 74–77 · Family edition week 19
  2. Lesson 14: Two ways to decideBook p. 78–81 · Family edition week 20
  3. Lesson 15: Pictures, places and promisesBook p. 82–85 · Family edition week 23
  4. Lesson 16: More than a day offBook p. 86–89 · Family edition week 24

ScienceGrade 1 Science book

  1. Lesson 8: Small movements make soundBook p. 54–58 · Family edition week 19
  2. Lesson 9: A message without wordsBook p. 59–62 · Family edition week 20
  3. Lesson 10: Light carries a codeBook p. 63–67 · Family edition week 21
  4. Lesson 11: Compare before choosingBook p. 68–71 · Family edition week 22
  5. Lesson 12: Our changing daylight recordBook p. 72–76 · Family edition week 23
  6. Lesson 13: The sky has patternsBook p. 77–82 · Family edition week 24

Grade 2 lessons in this unit

Lesson numbers and pages match your Grade 2 books. Each lesson opens its part of the week page.

Social StudiesGrade 2 Social Studies book

  1. Lesson 13: Different jobs in governmentBook p. 80–84 · Family edition week 21
  2. Lesson 14: Water crosses boundariesBook p. 85–88 · Family edition week 22

ScienceGrade 2 Science book

  1. Lesson 14: Compare before choosingBook p. 80–84 · Family edition week 22

Family edition: the six weeksThe six weeks