Lesson 2

Hundreds, Tens, and Ones

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

Students use mental math strategies to solve subtraction facts in Group 5.

  1. 5
  2. 50
  3. 6
  4. 60
  5. 2
  6. 20
  7. 20
  8. 2
  9. 40
  10. 4
  1. They are the same except the 5 and the 3 are in the tens place and zero is in the ones place for F.
  2. My answers are alike because they both subtracted 3 from 5. They are different because the numbers in E are smaller and they have no tens like the numbers in problem F.

E. Subtraction: Counting Strategies Again

Solve the subtraction problems. Use mental math. Write only the answers.

  1. 7 − 2 =
  2. 70 − 20 =
  3. 8 − 2 =
  4. 80 − 20 =
  5. 5 − 3 =
  6. 50 − 30 =
  7. 40 − 20 =
  8. 4 − 2 =
  9. 50 − 10 =
  10. 5 − 1 =
  1. Explain how solving Question E helped you solve Question F.
  2. How are your answers for Question E and Question F alike? How are they different?