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# Unit Overview: Addition and subtraction within 20

## Lessons:

10 lessons

### To add by counting on using a number line

In this lesson, we will learn how to use 'first, then, now' stories to add by counting on, using a number line.

• 1 Quiz
• 10m Video
• Presentation(PPT)
• Worksheet
• Transcript

### To subtract by counting back using a number line

In this lesson, we will learn how to use 'first, then, now' stories to subtract by counting back, using a number line.

• 2 Quizzes
• 9m Video
• Presentation(PPT)
• Worksheet
• Transcript

### To add a 1-digit number to a teens number using a known fact

In this lesson, we will learn how we can add a teens number using known number bonds.

• 2 Quizzes
• 11m Video
• Presentation(PPT)
• Worksheet
• Transcript

### To subtract a 1-digit number from a teens number using a known fact

In this lesson, we will learn how we can subtract from a teens number using known number bonds.

• 2 Quizzes
• 10m Video
• Presentation(PPT)
• Worksheet
• Transcript

### To use the 'Make ten' strategy to add two 1-digit numbers (Part 1)

In this lesson, we will identify expressions that are less than, equal to and greater than 10 and then apply the 'Make ten' strategy to add numbers.

• 1 Quiz
• 12m Video
• Presentation(PPT)
• Worksheet
• Transcript

### To use the 'Make ten' strategy to add two 1-digit numbers (Part 2)

In this lesson, we will practise using the 'Make ten' strategy to solve addition equations.

• 1 Quiz
• 9m Video
• Presentation(PPT)
• Worksheet
• Transcript

### To use the 'Make ten' strategy to subtract a 1-digit number from a teen number (Part 1)

In this lesson, we will connect the 'Make ten' strategy to subtraction and apply it to subtraction equations.

• 1 Quiz
• 12m Video
• Presentation(PPT)
• Worksheet
• Transcript

### To use the 'Make ten' strategy to subtract a 1-digit number from a teen number (Part 2)

In this lesson, we will practise using the 'Make ten' strategy to solve subtraction equations.

• 1 Quiz
• 11m Video
• Presentation(PPT)
• Worksheet
• Transcript

### To use mathematical models and strategies for addition

In this lesson, we will explore mathematical problems in context and consider different solutions.

• 1 Quiz
• 14m Video
• Presentation(PPT)
• Worksheet
• Transcript

### To use mathematical models and strategies for subtraction

In this lesson, we will explore mathematical problems in context and consider different solutions.

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