Public learning track
Mental Addition and Subtraction Fluency Within 20
2nd Grade · Math · Open Global Math
7 lessons
Goal
Master mental math strategies and achieve automatic recall for all addition and subtraction facts within 20.
Featured Diagrams
Mastering Doubles Facts Within 20
7 lessons
0 of 7 done
- 1Mastering Doubles Facts Within 20Up nextStart
- 2Using Near-Doubles to Add Within 20PremiumNot started yet
- 3Making Ten Addition StrategyNot started yet
- 4Bridging Through Ten for AdditionNot started yet
- 5Subtracting by Counting Back and Down to TenNot started yet
- 6Using Addition Facts to Solve SubtractionNot started yet
- 7Mixed Fact Fluency and Rapid Recall Within 20Not started yet
Standards Covered
- OGM.3.OA.1Open Global Math Standards 2026™ · Math · Level 3 / Grade 2 (Age 7) · Grade 2Recall and demonstrate automaticity and mental mastery of basic addition facts and related subtraction facts within 20 (including doubles, near-doubles, making ten, bridge-through-ten).
- OGM.3.OA.6Open Global Math Standards 2026™ · Math · Level 3 / Grade 2 (Age 7) · Grade 2Understand and apply operational properties: commutative and associative properties of addition, commutativity of multiplication, non-commutativity of subtraction and division, and inverse relationships (addition/subtraction and multiplication/division) to verify computations and solve equations.
Curriculum Framework
2nd Grade · Math · Open Global Math
1
7 lessons
Mental Addition and Subtraction Fluency Within 20
Master mental math strategies and achieve automatic recall for all addition and subtraction facts within 20.
2
5 lessons
Odd and Even Numbers: Pairing, Doubles, and Halves
Identify, analyze, and justify odd and even numbers up to 100 using pairings, equal sharing, and doubles.
3
6 lessons
One-Step and Two-Step Addition and Subtraction Word Problems
Model and solve complex one- and two-step word problems within 100 and 1,000 using bar models and algebraic equations.
4
6 lessons
Foundations of Multiplication: Equal Groups and Arrays
Build conceptual understanding of multiplication as equal groups, repeated addition, and rectangular arrays.
5
6 lessons
Foundations of Division: Equal Sharing and Grouping
Understand division as fair sharing (partitive) and repeated grouping (quotative), writing formal division equations.
6
5 lessons
Multiplication and Division Facts for 2, 5, and 10
Build fluency and rapid recall for multiplication and division facts involving 2, 5, and 10.
7
5 lessons
Multiplication and Division Facts for 3, 4, and 8
Derive and recall multiplication and division facts for 3, 4, and 8 using doubling and distributive strategies.
8
5 lessons
Properties of Operations and Mental Multiplication
Apply the associative, commutative, and distributive properties to calculate products mentally and verify equations.
9
4 lessons
Multiplying by Tens and Hundreds
Multiply single-digit whole numbers by multiples of 10 and 100 using base-ten place value strategies.
10
6 lessons
Multi-Step Mixed Operation Word Problems
Deconstruct, represent, and solve two- and three-step word problems involving all four operations.
11
5 lessons
Rates, Multiplicative Comparisons, and Cartesian Products
Model and solve problems involving constant unit rates, multiplicative comparisons (times as many), and combinations.
12
6 lessons
Patterns, Sequences, and Function Tables
Identify, extend, describe, and find missing elements in numerical, geometric, and input-output table patterns.