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# Unit Overview: Problem solving with integer addition and subtraction

## Lessons:

10 lessons

### Using and explaining addition strategies

In this lesson, we will be learning how to use different addition strategies (e.g. partitioning, commutativity and rounding and adjusting) in order to solve magic squares.

• 1 Quiz
• 22m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Using and explaining addition and subtraction strategies

In this lesson, we will be learning how to use the most efficient addition and subtraction strategies. We will apply this knowledge to solving addition pyramids.

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

### Adding and subtracting using multiples of 10, 100, 1000, 10 000 and 100 000

In this lesson, we will learn how to use the 'derived facts' and 'make 10' strategies to solve equations involving multiples of 10, 100, 1000, 10 000 and 100 000.

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

In this lesson, we will learn how to use the 'round and adjust' strategy to solve addition and subtraction equations.

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

### Adding and subtracting using partitioning

In this lesson, we will use partitioning to add and subtract large integers, both where regrouping is required and where it is not needed.

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

### Rounding to estimate

In this lesson, we will apply our understanding of rounding to the nearest multiples of 10 000 and 1000 to estimate the answer to addition equations.

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

### Adding using the column method

In this lesson, we will learn how to use the column method in order to solve addition equations.

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

### Subtracting using the column method

In this lesson, we will learn how to use the column method in order to solve subtraction equations. We will also learn how to represent equations using bar modelling.

• 2 Quizzes
• 27m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Problem solving using the column method

In this lesson, we will learn how to apply our understanding of the column method to finding and fixing errors and completing unfinished column method calculations.

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

### Solving multi-step addition and subtraction problems

In this lesson, we will be applying the addition and subtraction strategies that we have learned to word and real life problems.

• 2 Quizzes
• 25m Video
• Presentation(PPT)
• Worksheet
• Transcript