Lessons

Do It with Dominoes 4: Balancing Discoveries

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.1

Represent addition and subtraction with objects, fingers, mental images, drawings, sounds (e.g., claps), acting out situations, verbal explanations, expressions, or equations.

Grade 1

Operations and Algebraic Thinking

Represent and solve problems involving addition and subtraction.

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.

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.*Grade 2

Operations and Algebraic Thinking

Represent and solve problems involving addition and subtraction.

2.OA.A.1

Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

Ohio Mathematics Academic Content Standards (2001)

Number, Number Sense and Operations Standard

Benchmarks (K–2)

G.

Model, represent and explain addition as combining sets and counting on.

Grade Level Indicators (Grade Kindergarten)

10.

Model and represent addition as combining sets and counting on, and subtraction as take-away and comparison. For example:

a. Combine and separate small sets of objects in contextual situations; e.g., add or subtract one, two, or another small amount.

b. Count on (forward) and count back(backward) on a number line between 0 and 10.

a. Combine and separate small sets of objects in contextual situations; e.g., add or subtract one, two, or another small amount.

b. Count on (forward) and count back(backward) on a number line between 0 and 10.

Grade Level Indicators (Grade 1)

10.

Model, represent and explain addition as combining sets (part + part = whole) and counting on. For example:
a. Model and explain addition using physical materials in contextual
Situations.
b. Draw pictures to model addition.
c. Write number sentences to represent addition.
d. Explain that adding two whole numbers yields a larger whole number.

12.

Use conventional symbols to represent the operations of addition and subtraction.

Principles and Standards for School Mathematics

Number and Operations Standard

Understand meanings of operations and how they relate to one another

Expectations (Pre-K–2)

understand various meanings of addition and subtraction of whole numbers and the relationship between the two operations;

Students use a pan balance or a balance beam to explore addition combinations. They may also use the interactive balance applet for further exploration. The lesson includes recording sheets, discussion questions, suggestions for assessment, and questions for teacher reflection. (sw)