Lesson 10

The purpose of this lesson is for students to apply place value reasoning to write and solve number riddles.

This lesson continues the work with number riddles from the previous lesson. Students write their own riddles and then try to find each other’s secret number.

The cool-down should be completed before the lesson synthesis, as students will share their reflections with the whole class.

If students need additional support with the concepts in this lesson, refer back to Unit 4, Section B in the curriculum materials.

• Each group of 2 needs to begin with a riddle envelope from the previous activity. 

Reflect on the ways you have seen yourself grow in your teaching of mathematics over the course of the school year. In what area have you made the most significant growth? What led to this growth?