Unit Plan 33 (Grade K Math): Teen Numbers—Show & Tell
Represent teen numbers (11–19) as ten and some ones using multiple models—ten-frames, cubes, drawings—and justify how each model matches with a 10 + n equation.
Focus: Present teen numbers (11–19) as ten and some ones using multiple models (ten-frames, cubes, drawings) and explain/justify how the models match.
Grade Level: K
Subject Area: Mathematics (Number & Operations in Base Ten)
Total Unit Duration: 5 sessions (one week), 30–40 minutes per session
I. Introduction
Students build understanding that each teen number is one group of ten and some ones. They model the same number in different ways—ten-frames, linking cubes, drawings/number bonds—and practice explaining why the models are equivalent and how they connect to equations like 10 + n.
Essential Questions
- How does a teen number show ten and some ones?
- What stays the same across different models of the same number?
- How can I convince someone that two models match the same number?
II. Objectives and Standards
Learning Objectives — Students will be able to:
- Represent 11–19 as ten and some ones with ten-frames, cubes, and drawings.
- Use number bonds/part–part–whole to show 10 and the ones for any teen number.
- Write/read matching equations of the form 10 + n to represent a teen number.
- Explain and justify how two different models show the same number (MP.3).
Standards Alignment — CCSS Kindergarten (threaded across the unit)
- K.NBT.1: Compose/decompose numbers 11–19 into ten ones and some further ones; represent with objects/drawings and a written numeral.
- Mathematical Practices: MP.3 (construct arguments & critique) emphasized; MP.5 (tools) and MP.6 (precision) threaded.
Success Criteria — Student Language
- I can show a teen number as ten and some ones with a model.
- I can write an equation like 10 + 7 = 17 that matches my model.
- I can explain how two models show the same number.