Review of first grade addition/subtraction strategies is the focus of this question. (See Standard 1.OA.C.6 for a list of mental strategies)
Math in Practice and Mastering the Basic Facts in Addition and Subtraction by Susan O'Connnell contain these strategies. Resources here.
Students should have a solid foundation of addition and subtraction to 10 by the end of this question. Working within 20 is an end of year goal.
This is the first exposure to the terms and concepts of odd and even numbers.
Seesaw Numeracy Assessments: K-1 Gr1-2 Gr2
∎ Students will reason abstractly and quantitatively to add and subtract within 20 (focus within 10, within 20 is end of year goal). (2.OA.B.2 )
∎ Students will develop an understanding of even and odd numbers by representing them with collections of objects that can or can’t be paired or that can or can’t be divided into two equal groups. (2.OA.C.3) (SMP 2) (SMP 7) (SMP 8)
I can use mental strategies to fluently add and subtract within 10. (2.OA.B.2)
I know from memory all sums of two one-digit numbers within 10. (2.OA.B.2)
I can determine when to add or subtract using numbers within 10 (2.OA.B.2)
I can determine whether a group of objects has an odd or even number of members. (2.OA.C.3)
I can write an equation to express an even number as a sum of two equal addends. (2.OA.C.3)
∎ Major Content ⊡ Supporting Content 🌕 Additional Content
Math Vocabulary cards in Spanish and English
Addition Facts/ Expression Commutative Property Difference/compare Open number line Digit/Number Doubles
Equation/Number Sentence fact family Inverse Leftover Near doubles Number Names Odd/Even
Sum/ Total
Teacher Note: Teaching different terms interchangeably for math skills (sum/total) can help the student to build a comprehensive math vocabulary
2nd grade number talk guide printable & 2nd grade number talks
Choose which strategy students need to practice. You may find that they need many, so start with one for a week or so, then move onto another. You are looking for efficient strategies, not mastery of all strategies. Students may find they prefer one strategy over another or change strategies for different problems. The goal is that they are flexibly using efficient strategies and are able to reason about numbers to fluently compute.
Addition Strategies
Count on within 20 Math Flips
Break apart by place value teen numbers Math Flips
Subtraction Strategies
I can use mental strategies to fluently add and subtract within 10.
I know from memory all sums of two one-digit numbers within 10.
I can determine when to add or subtract using numbers within 10.
Ready Teacher Toolbox Lesson 1: Mental Math strategies for addition -Sessions 1-4
Lesson 2: Mental Math strategies for subtraction-Sessions 1-4
Assessment Tasks 2.OA.B.2 **Full fluency by END of Grade 2 Frayer Model Assessment Proficiency Rubrics 2.OA.B.2
Math in Practice: 2.OA.B.2 Module 2 (within 10 pp46-48) Math in Practice lesson slides & Essential Question Guide MIP Resource folder
Open Middle tasks Printable activities & Centers Nearpod Math lessons
Prior knowledge/Just in Time support & Enrichment RTTB Lesson 1 Can You Prove It? & Lesson 2 Mystery Number
I can determine whether a group of objects has an odd or even number of members.
I can write an equation to express an even number as a sum of two equal addends.
Ready Teacher Toolbox Lesson 32: Even and Odd Numbers -Sessions 1-3
Assessment Tasks 2.OA.C.3 Frayer Model Assessment Proficiency Rubrics 2.OA.C.3
Math in Practice: 2.OA.C.3 Module 3 (Even/Odd pp71-80) Math in Practice lesson slides & Essential Question Guide MIP Resource folder
Printable activities & Centers Nearpod Math lessons
Prior knowledge/Just in Time support & Enrichment RTTB Lesson 32 Exploring Structure with Odd & Even
“Closure in a lesson does not mean to pack up and move on. Rather, it is a cognitive activity that helps students focus on what was learned and whether it made sense and had meaning.” How the Brain Learns Mathematics (2007) P. 104
There are many ways to wrap up and reflect the day's activities but this step is often overlooked or rushed. Purposely plan and allow time for students to have closure each day (even if it means setting a timer or daily alarm so you don't run out of time).
Ideas for closure activities
Addition/subtraction basic facts Mastering the Basic Facts book:
Foundational facts
These are activities to give students mixed, spaced practice based on the big ideas for 2nd grade math.
Making a ten (Illustrative Math)
Remover (HCPSS-adapted resource/game)
These resource sheets are intended to reinforce procedures and concepts. They should not be used as a source of direct instruction or whole-group practice. Please select pages carefully based on your students' needs.
You may have students work on these with a partner, independently with an answer key to self-check (tip: use sheet protectors), or as a journal response. It is not necessary to have students complete a page every day- the intent is to have opportunities to spiral concepts for mixed practice, not do "busy" work.
*these are reviewing 1st grade skills to start the year