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# Unit Overview: Addition and subtraction

## Lessons:

15 lessons

### Deriving addition and subtraction facts

In this lesson, we will derive addition and subtraction facts by using part whole models to show how related facts can be derived from scaling up by 10, 100 or 1000.

• 1 Quiz
• 21m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Deriving addition and subtraction facts by using given calculations

In this lesson, we will derive addition and subtraction facts by using given calculations, consider how the whole or parts have changed and the impact this has on the new calculation.

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

In this lesson, we will look at addition equations and decide the best and most efficient strategy we could use to solve them.

• 2 Quizzes
• 20m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Choosing appropriate subtraction strategies

In this lesson, we will look at subtraction equations and decide the best and most efficient strategy we could use to solve them.

• 2 Quizzes
• 22m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Applying and consolidating: Related number facts and appropriate strategies

In this lesson, we will apply and consolidate our knowledge of deriving related number facts and most efficient strategies for calculating addition and subtraction equations. We will recap our key learning and apply that learning to answer different questions.

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

### Adding using the column method

In this lesson, we will use the column method to add two four digit numbers where regrouping is required in one column.

• 2 Quizzes
• 26m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Adding using the column method, when multiple columns require regrouping

In this lesson, we will use the column method to add two four digit numbers where regrouping is required in multiple columns.

• 2 Quizzes
• 21m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Subtracting using the column method

In this lesson, we will use the column method to subtract two four digit numbers where regrouping is required in one column.

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

### Subtracting using the column method, when multiple columns require regrouping

In this lesson, we will use the column method to subtract two four digit numbers where regrouping is required in multiple columns.

• 2 Quizzes
• 24m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Subtracting from multiples of 1000

In this lesson, we will explore how to calculate from a multiple of 1000.

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

### Applying and consolidating: Column method for addition and subtraction

In this lesson, we will consolidate our knowledge of the column method for both addition and subtraction by recapping the method, completing examples and applying our learning.

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

### Representing one-step word problems

In this lesson, we will use bar models to represent addition and subtraction in one-step word problems.

• 2 Quizzes
• 22m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Representing comparison word problems

In this lesson, we will use comparison bar models to represent addition and subtraction in one-step word problems.

• 2 Quizzes
• 23m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Solving two-step word problems

In this lesson, we will use bar models to represent two-step addition and subtraction word problems.

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

### Applying and consolidating: Word problems and bar models

In this lesson, we will recap our knowledge of how to use bar models to represent word problems which require addition or subtraction.

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