What’s Missing?

Students find missing numbers in equations using the relationship between addition and subtraction. Note: Activity 2 was updated in the Teacher Edition PDF and in the Teacher Presentation Screens on 1/12/2026.

By Amplify Classroom

Grades: 2nd Grade

Subject: Math

Learning goals: Today’s Goals • Make equations with missing numbers true. • Write addition and subtraction equations, including those with missing numbers, to represent the relationship between the parts and totals shown in cube towers and tape diagrams. • Language Goal: Explain the reasoning used in making equations with missing numbers true. (Speaking and Listening) Materials Manipulative Kit: connecting cube towers of`10`, single cubes, double `10`-frames