Common Core State Standards

# CCSS.MATH.CONTENT.2.NBT.B.9

Explain why addition and subtraction strategies work, using place value and the properties of operations.

13 teaching resources for those 'aha' moments

### Addition Strategy - Decompose, Then Make 10 Worksheet

Build addition strategies using digits 1-10 with this two-page decomposing numbers worksheet.

4 pages Grades: 1 - 2

### Addition Strategy - Counting On Worksheet

Solve addition problems in this 2-page Counting On Addition Worksheet.

4 pages Grades: 1 - 2

### 10 Blank Ten Frames

A template including 10 blank ten frames.

1 page Grades: K - 2

### Number Talks - Place Value Task Cards

Build number sense skills with this set of 24 task cards.

24 pages Grades: 1 - 4

### Number Talks - Double Digit Subtraction Task Cards

Build number sense skills with this set of 24 task cards.

24 pages Grades: 1 - 3

### Number Talks - Double Digit Addition Task Cards

Build number sense skills with this set of 24 task cards.

24 pages Grades: 1 - 3

### Fact Family Find and Flip - Double-Digit Addition and Subtraction

A game to practice working with addition and subtraction fact families using double-digits.

1 page Grades: 2 - 3

### Fact Family Find and Flip - One- and Two-Digit Addition and Subtraction

Addition and subtraction game cards demonstrating the relationship between fact families.

1 page Grades: 1 - 2

### Mental Math Subtraction Posters

9 posters outlining mental math strategies for subtraction.

9 pages Grades: 1 - 5

### Mental Math Addition Posters

9 posters outlining mental math strategies for addition.

9 pages Grades: 1 - 5

### Double-Digit Subtraction Strategies - Posters

A set of four posters showing different subtraction strategies.

4 pages Grades: 2 - 3

### Double-Digit Addition Strategies Posters

A set of four posters showing different addition strategies.

4 pages Grades: 2 - 3

### Number Talks Teaching Resource Pack - Grade 2

A collection of number talks teaching resources that support meaningful and highly engaging conversations in the mathematics classroom.

478 pages Grade: 2