In this unit, students will extend their understanding of composing and decomposing numbers to include numbers up to 10. Students will understand that numbers can be put together and taken apart in different ways without changing the total. Finally, they will use addition and subtraction to solve realworld problems using objects and/or pictures.
Key Concepts:
 There is more than one pair of addends that can be combined to make a total.
 A total can be taken apart into more than one pair of addends.
 We can solve realworld addition and subtraction problems using objects or drawings.
Prior Knowledge Needed:
 Count to 10 (K.CC.1)
 Understand that the last number name said tells the number of objects counted (K.CC.B.4.B; GK_U1)
 Onetoone correspondence (K.CC.B.4.A; GK_U1)
 Count to answer “how many” questions (K.CC.B.5; GK_U2)
 Understand and represent addition within 5 (K.OA.A.1; GK_U4)
 Understand and represent subtraction within 5 (K.OA.A.1; GK_U6)
Units on the Horizon:
 Composing 10 (Kindergarten, Unit 12)
 Compose and decompose numbers 11  19 as some tens and ones (Kindergarten, Unit 14)
 Solving problems and demonstrating fluency within 5; (Kindergarten, Unit 16)
 Using data to add and subtract to 20; (Grade 1, Unit 2)
Lessons

Lesson objective: Understand addition as putting together. Students bring prior knowledge of addition from K.OA.A.1. This prior knowledge is extended to numbers up through 10 as students compose numbers using pairs of addends. A conceptual challenge stu...

Lesson objective: Add numbers with sums to 10. This lesson helps to build procedural skill with whole number addition. Modeling addition with objects and drawings is used here because it supports students' understanding of the partpartwhole relationsh...

Lesson objective: Compose numbers to 10 in different ways. This lesson provides an opportunity for students to apply their knowledge and understanding of composing numbers to a reallife situation. Students are asked to compose the number seven in diffe...

Lesson objective: Decompose numbers less than or equal to 10 into pairs in more than one way. Students bring prior knowledge of addition and subtraction from K.OA.A.1. This prior knowledge is extended to decomposing numbers into pairs in more than one w...

Lesson objective: Decompose numbers less than or equal to 10 into pairs in more than one way. This lesson helps to build procedural skills with decomposing numbers. Modeling with twosided counters is used here because it supports students as they build...

Lesson objective: Decompose numbers less than or equal to 10 into pairs in more than one way. This lesson provides an opportunity for students to apply their knowledge and understanding of subtraction to a reallife situation. Students are asked to find...

Lesson objective: Understand that addition and subtraction can be used to solve realworld problems. Students bring prior knowledge of addition and subtraction from K.OA.A.1. This prior knowledge is extended to realworld problems as students use object...

Lesson objective: Understand subtraction as taking from. This lesson helps to build fluency with whole number subtraction. The game Munching Monster is used here because it supports students' understanding of subtraction as taking from and fluency in su...

Lesson objective: Use objects and drawings to solve realworld addition and subtraction problems. This lesson provides an opportunity for students to apply their knowledge and understanding of addition and subtraction to a reallife situation. Students ...

Lesson objective: Use objects and drawings to solve realworld addition and subtraction problems. This lesson provides an opportunity for students to apply their knowledge and understanding of addition and subtraction to a reallife situation. Students ...