SALTA 2nd grade

2.OA.1 2.OA.2

Strand: Operations and Algebraic Thinking Second grade students will fluently add and subtract within 20.

Topic 1: Fluently Add and Subtract Within 20 Pick a Project: • More Than 4 Legs • Water Fun Facts • Creative Collage

Topic 1:

• equation • addend • sum • doubles • near doubles • difference • bar diagram

Standard 2.OA.1 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 by, for example, using drawings and equations with a symbol for the unknown number to represent the problem.

1-1 1-2 1-3 1-4 1-5 1-6 1-7 1-8

Addition Fact Strategies Doubles and Near Doubles

Make a 10 to Add

Standard 2.OA.2 Fluently add and subtract within 20.

Addition Fact Patterns

Count On and Count Back to Subtract

A. Add and subtract within 20 using mental strategies such as counting on; making ten ( for example, 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14 ); decomposing a number leading to a ten ( for example, 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9 ); using the relationship between addition and subtraction ( for example, knowing that 8 + 4 = 12, one knows 12 – 8 = 4 ); and creating equivalent but easier or known sums ( for example, adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13 ).

Think Addition to Subtract Make a 10 to Subtract

Practice Addition and Subtraction Facts 1-9 Solve Addition and Subtraction Word Problems 3-ACT Math: Losing Marbles 1-10 Math Practices and Problem Solving: Construct Arguments

B. By the end of Grade 2, know from memory all sums of two one-digit numbers.

Topic 1 Manipulatives: •

Connecting Cubes

Counters

• •

Double ten-frame mat

Assessment Options: Topic 1 Assessment – Fluently Add and Subtract Within 20 (print or online) Topic 1 Performance Assessment – Fluently Add and Subtract Within 20 Team Created Assessment

Assessment Tasks – Topic 1 USBE 2 nd Grade Standards Assessments

Procedural Check

Application Task

2.OA.1

Solve each equation. 11 + 1 – 6 = ?

Solve each problem. Draw pictures to justify your answers. • Demetri had 14 pennies. Chase gave him some more. Now Demetri has 20 pennies. How many pennies did Chase give him? • Talia and Becca put 17 pennies in a jar. Talia put in 9 pennies. How many pennies did Becca put in the jar? • Lyla has 8 more pennies than Scott. Lyla has 15 pennies. How many pennies does Scott have? (DOK 3)

12 + ? – 3 = 11

? – 9 + 15 = 16

(DOK 1)