Lesson 3

Doubles

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

TIMS Bit

Among other strategies, students can use their knowledge of the multiplication facts to solve division facts. Encourage students to share their strategies.

  1. 70; 10;
    70; 7
  2. 10; 2;
    10; 5
  3. 30; 6;
    30; 5
  4. 40; 10;
    40; 4
  5. 45; 5;
    45; 9

E. Fact Families for 5s and10s

New uniforms for the girls basketball team were delivered today at Oakland High. Each box contained 8 uniforms. If 40 uniforms were ordered in all, how many boxes arrived?

There are 5 groups of 8 in 40. Think: ? × 8 = 40 or 40 ÷ 8 = ?

The answer to both questions is 5 boxes.

Solve the following problems. Each group of facts is related.

  1. 10 × 7 = __________

    		 70 ÷ 7 = __________
    7 × 10 = __________

    		 70 ÷ 10 = __________
  2. 2 × 5 = __________

    		 10 ÷ 5 = __________
    5 × 2 = __________

    		 10 ÷ 2 = __________
  3. 6 × 5 = __________

    		 30 ÷ 5 = __________
    5 × 6 = __________

    		 30 ÷ 6 = __________
  4. 4 × 10 = __________

    		 40 ÷ 4 = __________
    10 × 4 = __________

    		 40 ÷ 10 = __________
  5. 5 × 9 = __________

    		 45 ÷ 9 = __________
    9 × 5 = __________

    		 45 ÷ 5 = __________