What we like about this lesson

Mathematically:

• Allows students to begin visualizing the teen numbers as ten ones and some further ones (K.NBT.A.1)
• Gives students opportunities to practice "counting on" in a quick and efficient way during fluency practice (K.CC.A.2)
• Lays the foundations for students to reason abstractly and quantitatively about teen numbers (MP.2)

In the classroom:

• Uses multiple concrete representations and visual models to make the mathematics explicit
• Allows for whole group, partner, and individual work in one lesson
• Prompts students to share their developing thinking and understanding (Student Debrief and throughout lessons)
• Provides opportunities and suggestions for differentiation
• Gives formal and informal opportunities for teachers to check for understanding