Lessons

Do It with Dominoes 6: Finding Fact Families

Discipline

Mathematics

Grades

Kindergarten, 1, 2

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Common Core State Standards for Mathematics

Kindergarten

Operations and Algebraic Thinking

Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.

K.OA.A.3

Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).

Grade 1

Operations and Algebraic Thinking

Understand and apply properties of operations and the relationship between addition and subtraction.

1.OA.B.4

Understand subtraction as an unknown-addend problem.

*For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.*Add and subtract within 20.

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).

Work with addition and subtraction equations.

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 three whole numbers.

*For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 =**❏** – 3, 6 + 6 =**❏**.*Grade 2

Operations and Algebraic Thinking

Add and subtract within 20.

2.OA.B.2

Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.

Ohio Mathematics Academic Content Standards (2001)

Number, Number Sense and Operations Standard

Benchmarks (K–2)

K.

Demonstrate fluency in addition facts with addends through 9 and corresponding subtractions.

Grade Level Indicators (Grade Kindergarten)

8.

Represent and use whole numbers in flexible ways, including relating, composing and decomposing numbers; e.g., 5 marbles can be 2 red and 3 green or 1 red and 4 green.

Grade Level Indicators (Grade 1)

2.

Recognize and generate equivalent forms for the same number using physical models, words and number expressions; e.g., concept of ten is described by "10 blocks", full tens frame, numeral 10, 5 + 5, 15 - 5, one less than 11, my brother's age.

17.

Develop strategies for basic subtraction facts, such as:
a. relating to addition (for example, think of 7 - 3 = ? as 3 plus? equals 7");
b. one less, two less;
c. all but one (for example, 8 - 7, 5 - 4);
d. using tens frames; and
e. missing addends.

Grade Level Indicators (Grade 2)

10.

Demonstrate fluency in addition facts with addends through 9 and corresponding subtractions; e.g., 9 + 9 = 18, 18 - 9 = 9.

Principles and Standards for School Mathematics

Number and Operations Standard

Understand numbers, ways of representing numbers, relationships among numbers, and number systems

Expectations (Pre-K–2)

develop a sense of whole numbers and represent and use them in flexible ways, including relating, composing, and decomposing numbers;

Compute fluently and make reasonable estimates

Expectations (Pre-K–2)

develop a sense of whole numbers and represent and use them in flexible ways, including relating, composing, and decomposing numbers;

develop fluency with basic number combinations for addition and subtraction;

Students find different dominoes that have the same total number of spots. They write fact families for each of the different dominoes. The lesson includes discussion questions, suggestions for assessment, and questions for teacher reflection. (sw)