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# Unit Overview: Number sense and exploring calculation strategies

## Lessons:

15 lessons

### Exploring Number Sense

In this lesson, we will link and apply known facts using number sense, and explore different visual representations of numbers and their properties.

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

### Deriving New Facts From Number Bonds (Part 1)

In this lesson, we will investigate and find new facts from number bonds. We will investigate the effect of adding and subtracting 1 to numbers in a calculation, and the effect of adjusting the place value of digits.

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

### Number names

In this lesson, we will investigate the ways in which the names of numbers change as we make adjustments to the digits, and compare written numbers with their names.

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

### Recognising the value of each digit in a 2 digit number

In this lesson, we will investigate the place value of each digit in two digit numbers. We will look at visual representations of the value of each digit.

• 2 Quizzes
• 8m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Using comparative symbols to compare numbers

In this lesson, we will introduce the greater than, and less than symbols > and <, and use them to accurately compare different numbers.

• 2 Quizzes
• 6m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Deriving New Facts From Number Bonds (Part 2)

In this lesson, we will look at the properties of addition and subtraction, including the law of commutativity. We will revisit place value and consider addition and subtraction as inverse operations.

• 2 Quizzes
• 5m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Finding number bonds for numbers up to 20

In this lesson, we will be using number bonds and looking for patterns for numbers within 20. We will look at partitioning and part whole modelling.

• 2 Quizzes
• 7m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Applying number bonds within ten to add and subtract

In this lesson, we will be adding and subtracting 2 digit numbers without regrouping by using our number bond knowledge and using visual representations of place value.

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

### Applying number bonds within twenty to add and subtract

In this lesson, we will be adding and subtracting 2 digit numbers with regrouping by using our number bond knowledge. We will use number lines to visualise the process.

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

In this lesson, we we will add and subtract 2 digit numbers by using the round and adjust strategy whereby numbers are rounded to the nearest five or ten, then adjusted again at the end of the calculation.

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

### Using round and adjust strategies to subtract and add near doubles

In this lesson, we will use round and adjust strategies to subtract and add near doubles. We will partition two digit numbers in order to make calculations easier.

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

### Using an 'adding on' strategy to find the difference

In this lesson, we will use an 'adding on' strategy to find the difference between two numbers. We will use real life shopping examples and look at model solutions.

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

### Using bar models to solve word problems (Part 1)

In this lesson, we will solve word problems using bar models as a visual tool to aid comparison between two values.

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

### Using bar models to solve word problems (Part 2)

In this lesson, we will solve word problems using bar models as a visual tool to aid addition and money problems involving change.

• 2 Quizzes
• 8m Video
• Presentation(PPT)
• Worksheet
• Transcript

### Application Lesson

In this lesson, we will apply all that we have learnt in this unit and practise answering different styles of questions involving addition and subtraction with modeled solutions.

• 1 Quiz
• 15m Video
• Presentation(PPT)
• Worksheet
• Transcript