The purpose of this activity is for students to write number riddles. Students choose a secret number between 1 and 120, and write four clues that will help their classmates identify the number. As students work, the teacher should review students’ riddles and monitor for groups that may need help writing clues.

• “What do you know about your secret number?”
• “How can you write a clue using ‘greater than’ or ‘less than’ or __ tens or ones?”

• “Put your clues in an envelope and write your names on the envelope.”

The purpose of this activity is for students to apply place value reasoning to solve number riddles written by their classmates. When students solve the number riddles they use their understanding of the number sequence and place value (MP7).

• “Were there any number riddles that were challenging to solve? Why were they more challenging than the other riddles?”