### Combining 2 quantities to find the totals

In this lesson, we will practise adding 2 quantities together by counting them all.

Skip navigation# Unit Overview: Addition and subtraction within 20

## Lessons:

### Combining 2 quantities to find the totals

### Exploring addition by adding on

### Exploring subtraction as partitioning

### Exploring subtraction as takeaway

### Comparing 2 sets of objects using 'more' or 'fewer'

### Investigating quantities using more or fewer

### Exploring the concept of doubles

### Finding half of numbers to 20

### Estimating and counting

### Reviewing addition and subtraction

10 lessons

In this lesson, we will practise adding 2 quantities together by counting them all.

In this lesson, we will add 2 quantities together by adding on. We will remember the initial amount and counting on from that to add on the next amount.

In this lesson, we will start learning about subtraction. We will look at the part-whole model and think about subtraction as partitioning, taking away a part of the whole and finding out how many are left.

In this lesson, we will continue learning about subtraction. We will think about subtraction as taking away and we will make up subtraction stories.

In this lesson, we will revise more and fewer by comparing groups of objects and deciding which group has more and which group has fewer.

In this lesson, we will compare quantities using the words 'more' and 'fewer.' We will solve a problem listening to clues to work out how many passengers are in each carriage of the train.

In this lesson, we will learn how to double with concrete objects and pictures. Then we will use a part-whole model to show doubling.

In this lesson, we will explore halving.

In this lesson, we will estimate the amount of items in a pot and count to check how many are actually there. We will see how close our estimation is to the actual amount.

In this lesson, we will recap addition and subtraction.

Units in Maths

- Early Mathematical Experiences
- Pattern and Early Number
- Numbers within 6
- Addition and subtraction within 6
- Measures
- Shape and sorting
- Calendar and Time
- Numbers within 10
- Addition and subtraction within 10
- Numbers within 15
- Grouping and Sharing
- Numbers within 20
- Doubling and halving
- Shape and pattern
- Addition and subtraction within 20
- Money
- Measures
- Depth of numbers within 20
- Numbers beyond 20

- Doubling and halving
- Addition and subtraction within 10
- Exploring calculation strategies within 20
- Money
- Measures
- 2-D shape, perimeter and area
- Numbers to 50
- Manipulating and calculating with fractions
- Fractions
- Fractions and decimals
- Conceptualising and comparing fractions
- Numbers 50 to 100 and beyond
- Reasoning with large whole numbers
- Converting units of measure
- Numbers to 10
- Solving measure and money problems
- Addition and subtraction within 20
- Addition and subtraction (applying strategies)
- Numbers within 1000
- Place value
- Problem solving with integer addition and subtraction
- Volume
- Positive and negative numbers
- Numbers within 10
- Numbers within 15
- Addition and subtraction within 20
- Measures (1): Length and mass
- Measures (2): Capacity and volume
- Addition and subtraction of 2-digit numbers
- Fractions
- Multiplication and division
- Multiplication and division
- Axioms and arrays
- Prime factor decomposition
- Indices and standard form
- Time
- Addition and subtraction of 2-digit numbers (regrouping and adjusting)
- Area and perimeter
- Numbers and numerals
- Percentages
- Fractions
- Measures: Length
- Numbers beyond 20
- Time
- Securing multiplication facts
- Addition and subtraction within 10
- Measures: Mass
- Number sense and exploring calculation strategies
- Addition and subtraction
- Securing multiplication and division
- Position and Direction
- Pattern and Early Number
- Addition and subtraction word problems
- Fractions
- Decimals
- Multiplication and division: 3 and 4
- Multiplication and division: 2, 5 and 10
- Measures: Capacity and volume
- Addition and subtraction
- Extending calculation strategies and additive reasoning
- Deriving multiplication and division facts
- Calculating with whole numbers and decimals
- Integers & Decimals
- Multiplication and division
- Grouping and Sharing
- Surds and trigonometry
- Numbers within 6
- Numbers within 100
- Exploring calculation strategies
- Time
- Exploring calculation strategies and place value
- Multiplication and division
- Factors and multiples
- Graphs
- Graphs
- Reasoning with 4-digit numbers
- Reasoning with patterns and sequences
- Calculation problems
- Numbers within 20
- Money
- Multiplication and division
- Fractions, decimals and percentages
- Decimals and measures
- Early Mathematical Experiences
- Order of operations
- Depth of numbers within 20
- Numbers to 20
- Addition and subtraction within 20 (comparison)
- Addition and subtraction within 6
- Accuracy and estimation
- Money
- Length and perimeter
- Fractions
- Fractions
- Problem solving with whole numbers and decimals