Chapter 3

Addition Facts to 10

1st Grade: Chapter 3 Outline

Week 5 - Week 7

Essential Questions:

    • How do I know if 5+3=10-2?
    • What is the meaning of the equal sign in a number sentence?
    • How do I know if an equation involving addition and subtraction is true or false?
    • How do I write a fact family from a given number sentence?
    • What strategies can I use to make addition or subtraction easier?

Content:

Students will know and understand:

    • count on to add
    • use number bonds to add in any order
    • write and solve addition sentences
    • write addition sentences
    • solve real-world problems
    • fact families- Commutative and Associative Properties
    • define properties of operation strategies
    • order (first, second)

Skills:

Students Will:

    • determine if an equation is true or false.
    • determine if both sides of an equation balance.
    • use mathematical tools and representations.
    • use properties and strategies to solve addition problems.
    • fluently add within 10.
    • use various strategies to solve problems.

Assessment

Chapter 3 Assessment: Addition Facts to 10

Formative Test: Common

Upon completion of Unit 3:

  • 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.
  • 1.OA.C.5. Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
  • 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).
  • 1.OA.D.7. Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2.
  • 1.OA.D.8. Determine the unknown whole number in an addition or subtraction equation relating to three whole numbers.
  • MP.2. Reason abstractly and quantitatively.
  • MP.4. Model with mathematics.
  • MP.5. Use appropriate tools strategically.
  • MP.6. Attend to precision.
  • MP.8. Look for and express regularity in repeated reasoning