  How to Teach Eureka Math Grade 1 Module 2

Eureka Math Grade 1 is broken into 6 Modules that span the course of the school year.  First Graders develop an understanding of addition, subtraction, and strategies for adding and subtracting within 20.

In first grade, students develop an understanding of whole number relationships and place value, including grouping in tens and ones.  There is also time spent on developing understanding of linear measurement and measuring lengths as iterating length units.  Students in first grade also reason about the attributes of geometric shapes. They also learn about composing and decomposing geometric shapes.

Students work with addition and subtraction alongside First Grade word problems.  Students also begin building fluency with addition and subtraction fact. This work lays the foundation for success in future grades.

Focus Standards

The focus standards for Grade 1 Module 2 are:

1.OA.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.2 – Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

1.OA.3 – Apply properties of operations as strategies to add and subtract. (Students need not use formal terms for these properties.) Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)

1.OA.4 – Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.

1.OA.6 – Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use mental 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.NBT.2 – Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:

• a. 10 can be thought of as a bundle of ten ones—called a “ten.”
• b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

Prerequisite Standards

The prerequisite standards, or standards that students should have mastered prior to engaging in this module are:

K.OA.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).

K.OA.4 – For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation.

K.NBT.1 – Compose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (e.g., 18 = 10 + 8); understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.

If students have not yet mastered these foundational skills, teachers may want revisit Eureka Math Kindergarten Module 4.  Pulling lessons from Kindergarten Module 4 for pre-teaching in a small group can support students, especially those with math disabilities and difficulties with being successful in the Eureka Math First Grade content.

Vocabulary

Newly introduced Grade 1 Module 2 includes: a ten, ones

Previously reviewed vocabulary includes: 5-groups, add, equals, number bonds, partners to ten, subtract, teen numbers

Topics Eureka Math Grade 1 Module 2

Eureka Math First Grade, Module 2 is then broken down into four topics:

Topic A – Embedded Numbers and Decompositions

During Topic A, students learn how to use the make ten strategy to solve addition problems with addends of 7, 8, and 9.

Topic B – Counting On from Embedded Numbers

In Topic B, students learn about subtraction up to 20.   They use the take from ten strategy, initially using it to subtract 9 from teen numbers (11–19).  Then students begin to use the take from ten and counting on strategies to subtract 7, 8, and 9 from teen numbers.

Topic C – Addition Word Problems

Students learn to solve a variety of word problems. Students will also work to understand the equal sign and solve equivalent expressions to make true number sentences.

Topic D – Strategies for Counting On

Students learn about the unit of 10.  For the first time, student learn about a unit made from 10 ones and name it a ten.  Students see that teen numbers are made of a ten and some ones.  For example 11 is 1 ten and 1 one while 12 is 1 ten and 2 ones.  Students then apply this new knowledge when they solve addition and subtraction problems.

Teaching Eureka Math Virtually

Eureka Math is a comprehensive mathematics curriculum that is used by many school districts all over the country.  However, teaching math during the pandemic has been a challenge for many teachers.

Whether hybrid or virtual, it is difficult to deliver any paper-based curriculum without some form of digital adaptation.  That is why we created standards-based digital math practice problems that can also be correlated to the Eureka Math Modules and Topics.

These problems are created using Google Slides and include virtual manipulatives which can help with making your digital math lessons more engaging.  These digital problem sets are also perfect for assigning for a technology center during in-person learning or for additional math practice at home.