## Reflection: Staircase of Complexity Excellent Eighteen - Section 2: Independent practice

It strikes me that the kids are becoming so confident and comfortable with talking about teen numbers! Honestly, in the past, teen numbers were so tricky, and MANY students seemed to miss the idea that teen numbers were those numbers in between our little "less than 10" numbers and the twenties. Teens can be baffling--simply by the fact that not ALL of them even have "teen" in the number! (Thanks 11 and 12--rebel numbers, who really should be one-teen and two-teen!!!) The hands-on nature of actually building teen numbers, as well as showing how a group of 10 is made and grouped with some extra ones, really makes a difference.

I take a moment to remember that over 90% of my students didn't correctly identify numbers to 10 when we started kindergarten--the fact that we're correctly identifying, writing, and assigning quantities to teen numbers (MP.2)--with precision (MP.6), proper math models (MP.4) and tools like 10-frames and double 10-frames (MP.5) is really exciting! Sure, it's easy to say kids with limited early academic backgrounds are at a disadvantage, but with careful planning, hands-on activities, careful attention to concept development and vocabulary, we can build our own background knowledge as we go! The critical factor is being consistent, having high expectations, and keeping learning FUN.

Consistency builds our own background knowledge!
Staircase of Complexity: Consistency builds our own background knowledge!

# Excellent Eighteen

Unit 14: Tricky Teen Numbers
Lesson 8 of 12

## Big Idea: Students will enjoy hands-on activities with the number 18 and the concept of building a 10 and extra ones.

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1 teacher likes this lesson
Standards:
Subject(s):
Math, Number Sets, counting
50 minutes

### Michelle Novelli

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