Wave a Magic Wand

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Objective

SWBAT find combinations of 10 and record them using number sentences. SWBAT articulate what strategy they used to find the combinations.

Big Idea

The majority of the Common Core for first graders is built around the concept of base 10. Students build their understanding of 10 in this rigorous task!

Lesson Author

Amanda Cole

New Orleans, LA

Grade Level

First grade

Subjects

Math

Number Sense and Operations

Operations

Standards

1.OA.A.1

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

1.OA.B.3

Apply properties of operations as strategies to add and subtract. Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)

1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 - 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

Setting Up the Learning

5 minutes

Common Core emphasizes instruction through complex tasks. In this lesson, students have to think critically about ways to make a single number, which is very rigorous for a little one! The more students understand what 10 means and how to build it, the better they will understand future Operations and Algebraic thinking standards, as well as the Numbers in Base 10 standards.

Review:

We have been learning about the combinations of 7, 8, 9 and 10. Today we are going to push our brains to learn all the ways to make 10.

Connect:

10 is our best friend in math! When we understand all the ways to make 10, it will help us as we solve hard problems in first and even 2nd grade!

Objective:

Your thinking job is: What strategies can I use to find the ways to make 10?

Opening Discussion

15 minutes

Present the problem on anchor chart:

I want to build a magic wand out of 10 cubes. Some of my cubes are black and some of my cubes are yellow. How can I build my magic wand?

To push kids to think about the missing part, I'll present them with 6 black cubes I already have and ask them to help me finish building my wand.

Guiding Questions:

How many cubes long will my magic wand be in total?
How many cubes are black?
What am I trying to figure out?
Partner talk: How many yellow cubes will I need to use to make my magic wand?

See this video for the rest of the opening discussion! You'll see how we discuss the missing part and how we find other combinations as a class.

Strategy Share

15 minutes

I'll give students 5-7 minutes to figure out the missing part and record how they figured it out in their math journals. If students finish early, they can show other combinations they found in their journal.

We will then briefly come back together to discuss what combinations they found.

See this video of our class strategy share! In the video, you'll see how we quickly discuss 2 strategies for finding the missing part-cubes and counting on- before I send kids off to find other combinations on their own.

Independent Practice

15 minutes

Group A: Intervention

Students have the support of ten boxes to place the cubes in. Students record combinations.

Group B/C: On Track and Extension

Students use a variety of strategies to find all of the combinations of 10. If students finish, they write about how they know for sure they have all of the combinations.