Lesson 4

Big Base-Ten Pieces

Est. Class Sessions: 3

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

This DPP item provides practice with the fact families for the multiplication facts for the 5s and 10s.

  1. 20; 5; 4 × 5 = 20; 20 ÷ 5 = 4
  2. 30; 10; 10 × 3 = 30; 30 ÷ 10 = 3
  3. 50; 5; 5 × 10 = 50; 50 ÷ 5 = 10
  4. 40; 8; 5 × 8 = 40; 40 ÷ 8 = 5
  5. 60; 10; 10 × 6 = 60; 60 ÷ 10 = 6
  6. 80; 10; 8 × 10 = 80; 80 ÷ 10 = 8
  7. 20; 2; 10 × 2 = 20 and 20 ÷ 2 = 10
  8. 15; 3; 5 × 3 = 15 and 15 ÷ 3 = 5
  9. 35; 5; 5 × 7 = 35 and 35 ÷ 5 = 7
  10. 90; 10; 9 × 10 = 90 and 90 ÷ 10 = 9

K. More Fact Families for 5s and 10s

The following four facts are in the same fact family:

7 × 10 = 70
70 ÷ 7 = 10		 10 × 7 = 70
70 ÷ 10 = 7

Solve each pair of related number sentences.

Then give two other facts that are in the same fact family.

  1. 5 × 4 = 20 ÷ 4 =
  2. 3 × 10 = 30 ÷ 3 =
  3. 10 × 5 = 50 ÷ 10 =
  4. 8 × 5 = 40 ÷ 5 =
  5. 6 × 10 = 60 ÷ 10 =
  6. 10 × 8 = 80 ÷ 10 =
  7. 2 × 10 = 20 ÷ 10 =
  8. 3 × 5 = 15 ÷ 5 =
  9. 7 × 5 = 35 ÷ 7 =
  10. 10 × 9 = 90 ÷ 9 =