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# Unit Overview: Addition and subtraction within 20

## Lessons:

10 lessons

### Combining 2 quantities to find the totals

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

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

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.

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

### Exploring subtraction as partitioning

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.

• 11m Video
• Transcript

### Exploring subtraction as takeaway

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

• 10m Video
• Transcript

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

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.

• 12m Video
• Transcript

### Investigating quantities using more or 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.

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

### Exploring the concept of doubles

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.

• 10m Video
• Presentation(PPT)
• Transcript

### Finding half of numbers to 20

In this lesson, we will explore halving.

• 12m Video
• Presentation(PPT)
• Transcript

### Estimating and counting

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.

• 11m Video
• Presentation(PPT)
• Transcript