Lesson 1

500 Hats

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

TIMS Task

Use this DPP item to practice multiplication facts for the 9s.

Refer students to the 200 Chart if needed.

  1. 31
  2. 45
  3. 13
  4. First I figured out that 3 × 9 = 27. Then I figured out 4 × 9 = 36. I found all the odd numbers between 27 and 36: 29, 31, 33, 35, and then I found that 3 + 1 = 4, so the answer was 31.

B. Guess My Number Puzzles

  1. I am more than 3 × 9 and less than 4 × 9. I am an odd number. The sum of my digits is 4. What number am I?
  2. The sum of my digits is nine. If you skip count by 5s, you hit me. I am less than 50. What number am I?
  3. I am an odd number. I am more than half of 22 and less than half of 30. What number am I?
  4. Explain your strategy for solving Question 1.