Math1st and 2nd Six Weeks Grade 2 Family Letter: Addition and Subtraction to 200
Dear Second Grade Families,
During the first six weeks your child will review and continue to work on fact fluency, patterns and relationships of numbers as well as place value. During the second six weeks, your child will continue to explore patterns and relationships of numbers to 200. Students will represent, solve, and generate addition and subtraction problems using a variety of strategies based on place value and properties of operations. They will further their understanding of the relationship between addition and subtraction.
Your child will begin to compose and decompose 2-digit numbers in order to add and subtract. The use of both concrete and pictorial models, such as open number lines and base ten blocks, will enhance your child’s knowledge of place value. A strong understanding of how numbers can be composed and decomposed in a variety of ways will strengthen your child’s mental math abilities. Using and illustrating a part-part whole model that represents the given quantities provides a visual means of determining which operation can be used to solve an addition or subtraction problem. While this approach may seem different than the instructional approach from our childhood, please be reassured that students will be taught the traditional algorithm for adding and subtracting. Our state standards mandate that students use the traditional algorithm starting in 4th grade.
You can help your child in several ways.
● Encourage your child to practice basic addition/subtraction facts to establish automaticity. (Doubles, Combinations of 10, Doubles +1, etc.)
● Ask him/her to decompose/compose any numbers that they see or hear. “What are some different ways to break apart 12?” 10+2, 6+6, 4+4+4, etc.
● Give your child a 2-digit number and ask, “What is 10 more? What is 10 less? What is 20 more? What is 20 less?”
● Ask your child real-world math problems as they arise in everyday life. For example, “Count how many toys are on the floor. How many would there be if you took 12 away?”
● Explore and discuss the key terms in the box below.
The Second Grade Math Team
place value: the value of a digit’s location in a numeral
compose: to combine parts to create a whole (8 tens + 7 ones= 87, 7 tens + 16 ones = 87, etc.)
decompose: to break a whole into parts (45 = 40 + 5, 45 = 30 + 15, etc.)
sum: the answer when two or more numbers are added
difference: the answer when two numbers are subtracted
ten frame: math tool to help visually see numbers and combinations within ten
number sentence: an expression that includes numbers and symbols, such as + - < > =
algorithm: a set of steps used to solve a mathematical computationScienceSocial Studies
2nd Grade Freedom Week Unit-Parent Letter
Dear 2nd Grade Families,
During the first six weeks, second graders will be learning about rules and authority figures in the home, the school, and the local community. We will also participate in Freedom Week activities as the nation celebrates Constitution Day, September 17th. This unit will help students as they learn to participate as informed citizens in a Constitutional Republic.
Students will compare rules between home, school and local community. They will learn how authority figures in the home, the school, and the community, such as parents, principals, teachers, and police officers, are similar yet different. They will begin exploring the idea that different places have different rules and that authority figures make and enforce rules. Students will generate rules for the classroom.
Students will explore the idea of what it means to be free as they learn about patriotic symbols (such as Uncle Sam, the U.S. flag, and the Texas flag) and patriotic songs (such as The Star Spangled Banner and America the Beautiful). Students will develop an understanding of the meaning of the Pledge of Allegiance. Students will create a poster or a different type of visual display that portrays what they think freedom means.
You can help your child in several ways.
● Talk with your child about the rules they follow at school and at home.
● Discuss the consequences that occur when rules are not followed.
● Share the “why” behind the rules-to maintain order, safety and security.
● Discuss why and how we say the Pledge of Allegiance to the U.S. Flag and the Pledge to the Texas Flag.
● Point out the American flag and the Texas flag as you drive around town. Talk about how they are similar and how they are different.
● Listen to patriotic songs, such as The Star Spangled Banner and America the Beautiful and discuss what the lyrics imply.
● Share memories of patriotic holidays that your family celebrates such as Veterans Day, Memorial Day and Independence Day.
The Second Grade Team