Lesson 3

Kind of Bean

Est. Class Sessions: 3

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

Students can describe and compare strategies for solving the problems “in their heads.”

  1. 108
  2. 107
  3. 507
  4. 15
  5. 25
  6. 55
  1. Possible response: 99 is one less than 100, so 8 + 99 would be one less than 8 + 100, or 107.

M. More Mental Arithmetic

Solve these problems without paper and pencil. You may use a number line or mental math. Write down the answers. Explain how you found your answers.

  1. 8 + 100 =
  2. 8 + 99 =
  3. 8 + 499 =
  4. = 7 + 8
  5. = 7 + 18
  6. = 7 + 48
  1. Explain how solving Question A can help you solve Question B.