# Unit Overview: Addition and subtraction of 2-digit numbers

## Lessons:

10 lessons

### Using number bonds within 20 for addition

In this lesson, we will use our knowledge of number bonds within ten to begin deriving number bonds within 20.

• 1 Quiz
• 13m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Using number bonds within 20 for subtraction

In this lesson, we will use our knowledge of number bonds within ten to begin deriving number bonds within 20.

• 2 Quizzes
• 13m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Adding and subtracting ones from a 2-digit number

In this lesson, we will use our knowledge of number bonds within ten to begin deriving facts when adding or subtracting ones from numbers within 100.

• 2 Quizzes
• 17m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Adding and subtracting multiples of ten

In this lesson, we will use our knowledge of number bonds within ten to begin deriving facts when adding and subtracting multiples of ten within 100.

• 2 Quizzes
• 12m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Adding and subtracting tens from a 2-digit number

In this lesson, we will add and subtract multiples of ten by using number bonds to ten.

• 2 Quizzes
• 19m Video
• Presentation(PPT)
• Worksheet
• Transcript

In this lesson, we will identify which known number bonds will help us to add two 2-digit numbers and use known facts to derive new addition facts.

• 2 Quizzes
• 17m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Subtracting two 2-digit numbers

In this lesson, we will be identify which known number bonds will help us subtract a 2-digit number from a 2-digit number.

• 2 Quizzes
• 15m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Adding and subtracting two 2-digit numbers

In this lesson, we will apply our knowledge of number bonds within ten to derive 2-digit addition and subtraction number facts within 100.

• 2 Quizzes
• 18m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Exploring strategies to add three 1-digit numbers

In this lesson, we will be apply our knowledge of strategies such as number bonds to 10 and 20, doubles and near doubles to add three 1-digit numbers.

• 2 Quizzes
• 14m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Consolidating addition and subtraction of 2-digit numbers

In this lesson, we will revisit adding and subtracting two 2-digit numbers and exploring mental strategies to help us solve problems.

• 2 Quizzes
• 18m Video
• Presentation(PPT)
• Worksheet
• Transcript