Unpacking the Standards

Grade 2

Standard: 2.OA.1 Cluster (m)

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.

Essential Skills/Concepts / Teaching Notes/Strategies / Resources· Add to 100

· Subtract within 100

· Draw symbols to represent unknowns

· Explain thinking using words, symbols, and writing

· Understand the situation in the word problem

· Understand different types of add/subtract problems (See Framework p. 7)

· Understand there are different strategies to solve / - Model drawings

- Manipulatives

- Scaffold problems from one-step, to two-step, etc.

- Use trade books with word problems to collaboratively solve (i.e. After reading The Napping House, solve this word problem: When all the sleepers were piled up, how many feet were in the bed? Use pictures, numbers or words to show your thinking.)

- Anchor charts for sharing symbols

- Board math

- Daily word problem

- Students use document camera to demonstrate and justify their thinking

- Students write word problems for their classmates to solve / * One Hunter by Pat Hutchins (at K-5 Math Resources below)

* The Napping House by Audrey Wood (at K-5 Math Resources below)

* P. Bear’s New Years Party by Paul Owen Lewis(at K-5 Math Resources below)

* http://www.k-5mathteachingresources.com/2nd-grade-number-activities.html

* math journals

* PUSD problem solving poster

* www.cde.gov (Appendix F – more defined methods for solving single-digit addition/subtraction problems)

Standard: 2.OA.2 Cluster (m)

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

Essential Skills/Concepts / Teaching Notes/Strategies / Resources· Adding and subtracting within 10

· Counting on

· Convert to an easier problem

· Determine a strategy to use

· Fluency of computing

· Make 10 / - Games in centers

- Domino or dice games (choose two and find sum)

- Interactive games from NCTM

- Living chart of strategies (counting on, making tens, decomposing a number leading to ten, fact families, doubles, doubles plus 1)

- Math journals for strategies

- Number talks

- Board math

- Magic Square game (try to get each row to equal a given number)

- Number webs

- Make posters for student-developed mental strategies

- Flash cards

- Computer games

- Dots/dot patterns / * Two of Everything by Lily Toy Hong (activity at K-5 Resources site below)

*Ten frames/double ten frames

*Magic Square game at

http://illuminations.nctm.org/ActivityDetail

.aspx?ID=75

* http://www.k-5mathteachingresources.com/2nd-grade-number-activities.html

Standard: 2.OA.3 Cluster (s)

Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2’s; write an equation to express an even number as a sum of two equal addends.

Essential Skills/Concepts / Teaching Notes/Strategies / Resources· Count by 2’s

· Write addition equations for doubles

· Count 1-20

· Group objects into pairs

· Understand concept of even vs. odd

· Explain why a number is even or odd / - Songs for odd and even

-Using manipulatives (grab a handful and record how many pairs you have and how many extras)

- Modeling with concrete objects for grouping

- Odd and Even read alouds

- Have groups of students pair up in different pairings to determine even or odd when lining up

- Board math

- Using objects, find the numbers that will have some objects remaining and no objects remaining after separating the collections into two equal groups / * Manipulatives for grouping

* Doubles song/chant

* “Even Song” sung to Bingo (There was a farmer had a cow and Even was her name-o, 0,2,4,6,8)

* Even Stephen Odd Todd by Kathryn Cristaldi

* If You Were an Odd Number (Math Fun) By Marcie Aboff

* My Even Day and One Odd Day by Doris Fisher

Standard: 2.OA.4 Cluster (s)

Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.

Essential Skills/Concepts / Teaching Notes/Strategies / Resources· Understand repeated addition

· Write equations with multiple addends

· Recognize equal parts

· Counting by multiples/skip count

· Make equal groups/rows / - Walk the number line multiple times

- Use clearboard grids with counters

- Make arrays with a set number of counters (record all possibilities)

- Have students sit in arrays on the rug and use equation to calculate

-Board math / * Grid paper

* Clear board grids

* Pattern blocks for building arrays

* Number line on floor

* Making arrays activities at http://www.k-5mathteachingresources.com/2nd-grade-number-activities.html