2 - MATH

MATHEMATICS

Operations and Algebraic Thinking 2.OA

A. Represent and solve problems involving addition and subtraction.

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, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

Listen and Look Video explaining overview for Lesson 1-9 Solve Addition and Subtraction Word Problems

Student Video - Another Look for Lesson 1-9 Solve Addition and Subtraction Word Problems

Listen and Look Video explaining overview for Lesson 3-8 Solve One-Step and Two-Step Problems

Student Video - Another Look for Lesson 3-8 Solve One-Step and Two-Step Problems

Listen and Look Video explaining overview for Lesson 4-7 Solve One-Step and Two-Step Problems

Student Video - Another Look for Lesson 4-7 Solve One-Step and Two-Step Problems

Listen and Look Video explaining overview for Lesson 5-8 Solve One-Step and Two-Step Problems

Student Video - Another Look for Lesson 5-8 Solve One-Step and Two-Step Problems

Listen and Look Video explaining overview for Lesson 6-8 Solve One-Step and Two-Step Problems

Student Video - Another Look for Lesson 6-8 Solve One-Step and Two-Step Problems

Listen and Look Video explaining overview for Lesson 7-1 Represent Addition and Subtraction Problems

Student Video - Another Look for Lesson 7-1 Represent Addition and Subtraction Problems

Listen and Look Video explaining overview for Lesson 7-2 Mixed Practice: Solve Addition and Subtraction Problems

Student Video - Another Look for Lesson 7-2 Mixed Practice: Solve Addition and Subtraction Problems

Listen and Look Video explaining overview for Lesson 7-3 Continue Practice with Addition and Subtraction Problems

Student Video - Another Look for Lesson 7-3 Continue Practice with Addition and Subtraction Problems

Listen and Look Video explaining overview for Lesson 7-4 Solve Two-Step Problems

Student Video - Another Look for Lesson 7-4 Solve Two-Step Problems

Listen and Look Video explaining overview for Lesson 7-5 Continue to Solve Two-Step Problems

Student Video - Another Look for Lesson 7-5 Continue to Solve Two-Step Problems

Listen and Look Video explaining overview for Lesson 7-6 Math Practices & Problem Solving: Reasoning

Student Video - Another Look for Lesson 7-6 Math Practices & Problem Solving: Reasoning

B. Add and subtract within 20.

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

Listen and Look Video explaining overview for Lesson 1-1 Addition Fact Strategies

Student Video - Another Look for Lesson 1-1 Addition Fact Strategies

Listen and Look Video explaining overview for Lesson 1-2 Doubles and Near Doubles

Student Video - Another Look for Lesson 1-2 Doubles and Near Doubles

Listen and Look Video explaining overview for Lesson 1-3 Make a 10 to Add

Student Video - Another Look for Lesson 1-3 Make a 10 to Add

Listen and Look Video explaining overview for Lesson 1-4 Addition Fact Patterns

Student Video - Another Look for Lesson 1-4 Addition Fact Patterns

Listen and Look Video explaining overview for Lesson 1-5 Count On and Count Back to Subtract

Student Video - Another Look for Lesson 1-5 Count On and Count Back to Subtract

Listen and Look Video explaining overview for Lesson 1-6 Think Addition to Subtract

Student Video - Another Look for Lesson 1-6 Think Addition to Subtract

Listen and Look Video explaining overview for Lesson 1-7 Make a 10 to Subtract

Student Video - Another Look for Lesson 1-7 Make a 10 to Subtract

Listen and Look Video explaining overview for Lesson 1-8 Practice Addition and Subtraction Facts

Student Video - Another Look for Lesson 1-8 Practice Addition and Subtraction Facts

C. Work with equal groups of objects to gain foundations for multiplication.

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

Listen and Look Video explaining overview for Lesson 2-3 Use Arrays to Find Totals

Student Video - Another Look for Lesson 2-3 Use Arrays to Find Totals

Listen and Look Video explaining overview for Lesson 2-4 Make Arrays to Find Totals

Student Video - Another Look for Lesson 2-4 Make Arrays to Find Totals

Number and Operations in Base Ten 2.NBT

A. Understand place value.

1. Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones.Understand the following as special cases:

Listen and Look Video explaining overview for Lesson 9-2 Models and 3-Digit Numbers

Student Video - Another Look for Lesson 9-2 Models and 3-Digit Numbers

Listen and Look Video explaining overview for Lesson 9-3 Name Place Values

Student Video - Another Look for Lesson 9-3 Name Place Values

a. 100 can be thought of as a bundle of ten tens—called a “hundred.”

Listen and Look Video explaining overview for Lesson 9-1 Understand Hundreds

Student Video - Another Look for Lesson 9-1 Understand Hundreds

b. The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).

2. Count within 1,000; skip-count by 5s, 10s, and 100s. Identify patterns in skip counting starting at any number.

Listen and Look Video explaining overview for Lesson 9-6 Place-Value Patterns with Numbers

Student Video - Another Look for Lesson 9-6 Place-Value Patterns with Numbers

Listen and Look Video explaining overview for Lesson 9-7 Skip Count by 5's, 10's, and 100's to 1,000

Student Video - Another Look for Lesson 9-7 Skip Count by 5's, 10's, and 100's to 1,000

3. Read and write numbers to 1,000 using base-ten numerals, number names, and expanded form.

Listen and Look Video explaining overview for Lesson 9-4 Read and Write 3-Digit Numbers

Student Video - Another Look for Lesson 9-4 Read and Write 3-Digit Numbers

Listen and Look Video explaining overview for Lesson 9-5 Different Ways to Name the Same Number

Student Video - Another Look for Lesson 9-5 Different Ways to Name the Same Number

B. Use place value understanding and properties of operations to add and subtract.

5. Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

Listen and Look Video explaining overview for Lesson 3-1 Add Tens and Ones on a Hundred Chart

Student Video - Another Look for Lesson 3-1 Add Tens and Ones on a Hundred Chart

Listen and Look Video explaining overview for Lesson 3-2 Add Tens on an Open Number Line

Student Video - Another Look for Lesson 3-2 Add Tens on an Open Number Line

Listen and Look Video explaining overview for Lesson 3-3 Add Tens and Ones on an Open Number Line

Student Video - Another Look for Lesson 3-3 Add Tens and Ones on an Open Number Line

Listen and Look Video explaining overview for Lesson 3-4 Break Apart Numbers to Add

Student Video - Another Look for Lesson 3-4 Break Apart Numbers to Add

Listen and Look Video explaining overview for Lesson 3-5 Continue to Break Apart Numbers to Add

Student Video - Another Look for Lesson 3-5 Continue to Break Apart Numbers to Add

Listen and Look Video explaining overview for Lesson 3-6 Add Using Compensation

Student Video - Another Look for Lesson 3-6 Add Using Compensation

Listen and Look Video explaining overview for Lesson 3-7 Practice Adding Using Strategies

Student Video - Another Look for Lesson 3-7 Practice Adding Using Strategies

Listen and Look Video explaining overview for Lesson 4-1 Add with Partial Sums

Student Video - Another Look for Lesson 4-1 Add with Partial Sums

Listen and Look Video explaining overview for Lesson 4-2 Continue to Add with Partial Sums

Student Video - Another Look for Lesson 4-2 Continue to Add with Partial Sums

Listen and Look Video explaining overview for Lesson 4-3 Models to Add 2-Digit Numbers

Student Video - Another Look for Lesson 4-3 Models to Add 2-Digit Numbers

Listen and Look Video explaining overview for Lesson 4-4 Add 2-Digit Numbers

Student Video - Another Look for Lesson 4-4 Add 2-Digit Numbers

Listen and Look Video explaining overview for Lesson 4-6 Practice Adding

Student Video - Another Look for Lesson 4-6 Practice Adding

Listen and Look Video explaining overview for Lesson 5-1 Subtract Tens and Ones on a Hundred Chart

Student Video - Another Look for Lesson 5-1 Subtract Tens and Ones on a Hundred Chart

Listen and Look Video explaining overview for Lesson 5-2 Count Back to Subtract on an Open Number Line

Student Video - Another Look for Lesson 5-2 Count Back to Subtract on an Open Number Line

Listen and Look Video explaining overview for Lesson 5-3 Continue to Count Back to Subtract on an Open Number Line

Student Video - Another Look for Lesson 5-3 Continue to Count Back to Subtract on an Open Number Line

Listen and Look Video explaining overview for Lesson 5-4 Add Up to Subtract Using an Open Number Line

Student Video - Another Look for Lesson 5-4 Add Up to Subtract Using an Open Number Line

Listen and Look Video explaining overview for Lesson 5-5 Break Apart Numbers to Subtract

Student Video - Another Look for Lesson 5-5 Break Apart Numbers to Subtract

Listen and Look Video explaining overview for Lesson 5-6 Continue to Break Apart Numbers to Subtract

Student Video - Another Look for Lesson 5-6 Continue to Break Apart Numbers to Subtract

Listen and Look Video explaining overview for Lesson 5-7 Subtract Using Compensation

Student Video - Another Look for Lesson 5-7 Subtract Using Compensation

Listen and Look Video explaining overview for Lesson 6-1 Regroup 1 Ten for 10 Ones

Student Video - Another Look for Lesson 6-1 Regroup 1 Ten for 10 Ones

Listen and Look Video explaining overview for Lesson 6-2 Models to Subtract 2-Digit and 1-Digit Numbers

Student Video - Another Look for Lesson 6-2 Models to Subtract 2-Digit and 1-Digit Numbers

Listen and Look Video explaining overview for Lesson 6-3 Subtract 2-Digit and 1-Digit Numbers

Student Video - Another Look for Lesson 6-3 Subtract 2-Digit and 1-Digit Numbers

Listen and Look Video explaining overview for Lesson 6-4 Models to Subtract 2-Digit Numbers

Student Video - Another Look for Lesson 6-4 Models to Subtract 2-Digit Numbers

Listen and Look Video explaining overview for Lesson 6-5 Subtract 2-Digit Numbers

Student Video - Another Look for Lesson 6-5 Subtract 2-Digit Numbers

Listen and Look Video explaining overview for Lesson 6-6 Use Addition to Check Subtraction

Student Video - Another Look for Lesson 6-6 Use Addition to Check Subtraction

Listen and Look Video explaining overview for Lesson 6-7 Practice Subtracting

Student Video - Another Look for Lesson 6-7 Practice Subtracting

7. Add and subtract within 1,000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Listen and Look Video explaining overview for Lesson 10-2 Add on an Open Number Line

Student Video - Another Look for Lesson 10-2 Add on an Open Number Line

Listen and Look Video explaining overview for Lesson 10-3 Add Using Mental Math

Student Video - Another Look for Lesson 10-3 Add Using Mental Math

Listen and Look Video explaining overview for Lesson 10-4 Add Using Partial Sums

Student Video - Another Look for Lesson 10-4 Add Using Partial Sums

Listen and Look Video explaining overview for Lesson 10-5 Use Models to Add

Student Video - Another Look for Lesson 10-5 Use Models to Add