In this unit, students deepen their understanding of 10. They extend their ability to compose and decompose numbers within 10 to focus on specific pairs of numbers that we can add to get exactly 10. In the final three lessons of the unit, they recognize that the value of ten does not change regardless of how it is composed. Students who have have not developed composite reasoning with number will struggle with seeing 10 in a variety of compositions. By composing, decomposing and comparing compositions of ten, students deepen their foundation of number, place value, addition and subtraction and equivalence.
Key Concepts:
 For any number 1 to 9, there is one number we can add to it to get 10.
 Every number 1 to 9 has a partner such that the two numbers can be composed to make 10.
 The value of ten does not change regardless of how it is composed.
Prior Knowledge Needed:
 Understand the relationship between numbers and quantities; the number of objects is the same regardless of their arrangement or the order in which they were counted; Grade K, Unit 2; K.CC.B.4b
 Decompose numbers within ten in multiple ways; Grade K, Unit 10; K.OA.A.3
 See addition as both adding to and putting together; Grade K, Unit 10; K.OA.A.1
Units on the Horizon:
 Understand that teen numbers are composed of ten ones and some more ones; Grade K, Unit 14; K.NBT.A.1
 Think of 10 as a bundle of ten ones called a “ten”; Grade 1, Unit 1; 1.NBT.B.2a
 Use strategies such as making ten to add and subtract; Grade 1, Unit 1; 1.OA.C.6
Lessons

Lesson objective: Understand that for any number one to nine, there is one number we can add to it to get 10. Students bring prior knowledge of seeing addition as adding on to a quantity from earlier work with K.OA.3. This prior knowledge is extended to...

Lesson objective: Add on to make 10. This lesson helps to build procedural skill with finding the number that makes 10 when added to a given number one through nine. 10 twosided counters are used here because they helps students track the total of 10 o...

Lesson objective: Solve problems that require you to find the one number that you add to another number to make 10. This lesson provides an opportunity for students to apply their knowledge and understanding of composing 10 to a reallife situation. Stu...

Lesson objective: Understand that every number one to nine has a partner such that the two numbers can be composed to make 10. Students bring prior knowledge of adding by putting together two numbers to make another number from earlier work with K.OA.3....

Lesson objective: Put together partner numbers to make 10. The 10frame is used here to help students track the total of 10 objects while also visualizing different combinations to compose 10. The number bond is used to build a mental picture of the rel...

Lesson objective: Solve problems that require you to find the one number that partners with another number one through nine to make 10. This lesson provides an opportunity for students to apply their knowledge and understanding of composing 10 to a real...

Lesson objective: Understand that the value of 10 does not change regardless of how it is composed. Students bring prior knowledge of composing and decomposing numbers from K.OA.3. This prior knowledge is extended to composing and decomposing 10 as stud...

Lesson objective: Practice finding partner numbers to make 10. This lesson helps to build fluency with finding combinations of 10. Cubes of 10 interlocking cubes are used to support the equivalence of various combinations of 10. This work develops stude...

Lesson objective: Practice finding different numbers that can partner to make 10. This lesson helps to build fluency with finding combinations of 10. Number bonds are used here to support the relationship between the various numbers that can partner to ...

Lesson objective: Solve problems by finding combinations of two numbers one through nine that equal 10. This lesson provides an opportunity for students to apply their knowledge and understanding of composing and decomposing numbers to a reallife situa...