Key Concepts
- Add numbers using place value.
- Use properties of operation to find the sum.
- Solve few model questions related to addition by using place
Introduction
Example 1:
3 – 2 = 1.
Find 2 + ____ = 3
Solution:
3 – 2 = 1.
So, 2 + 1 = 3.
Use addition fact to subtract
Example 2:
Find 5 – 3.
![Find 5 – 3.](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6365.png)
To find 5 – 3, you can think:
![To find 5 – 3, you can think:](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6364.png)
The missing number is the same in both equations.
![The missing number is the same in both equations](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6379.png)
You know the addition fact.
3 + 2 = 5
You also know the subtraction fact.
5 – 3 = 2
Example 3:
Find 15 – 4.
![Find 15 – 4.](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/1-32.png)
To find 15 – 4, you can think:
![To find 15 – 4, you can think:](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6380.png)
The missing number is the same in both equations.
![The missing number is the same in both equations.](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6381.png)
You know the addition fact.
4 + 11 = 15
You also know the subtraction fact.
15 – 4 = 11
Make a 10 to Subtract
Example 4:
Find how many more balls are needed to be added to make a ten?
![8 football](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6382.png)
Solution:
Add 2 more balls to make a ten.
![10 football](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6368.png)
Use the ten frames to make a 10 to subtract
Example 5:
Find 12 – 9
Solution:
![Find 12 – 9](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6383.png)
![Find 12 – 9](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6369.png)
![Find 12 – 9](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6370.png)
10 + 2 = 12
![10 + 2 = 12](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6371.png)
![10 + 2 = 12](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6384.png)
![10 + 2 = 12](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6372-1024x184.png)
Use the ten frames to make a 10 to subtract (Another way)
Example 6:
Find 12 – 9
Solution:
![Example 6:](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6373.png)
![Example 6:](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6374.png)
![Example 6:](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6385.png)
![Example 6:](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6375.png)
10 – 7 = 3
![10 – 7 = 3](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6376.png)
![10 – 7 = 3](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6377-1024x409.png)
![10 – 7 = 3](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6378.png)
Exercise
- Think addition and subtract,
6 – 4 =?
4 + ____ = 6
So, 6 – 4 = ____
- Think addition and subtract,
9 – 3 =?
3 + ____ = 9
So, 9 – 3 = ____
- Think addition and subtract,
12 – 4 =?
4 + ____ = 12
So, 12 – 4 = ____
- Complete the addition fact and subtract,
17 – 7 = ____
7 + ____ = 17
- Complete the addition fact and subtract,
14 – 8 = ____
8 + ____ = 14
- Make a ten to subtract by using counters and your workmate.
11
– 4
______
- Make a ten to subtract by using counters and your workmate.
16
– 9
______
- Chen had 13 animal stickers. He gave 5 of the stickers away. How many animal stickers does Chen have now?
- Angie bought 13 strawberries. She ate 8 of the strawberries. How many strawberries does Angie have now?
Concept Map
![Concept Map](https://www.turito.com/learn-internal/wp-content/uploads/2022/09/image-6386-1024x517.png)
What we have learned
- Use addition fact and subtract two numbers.
- Use the ten frames to make a 10 and subtract two numbers.
![addition to subtract](/_next/image?url=https%3A%2F%2Fwww.turito.com%2Flearn-internal%2Fwp-content%2Fuploads%2F2022%2F09%2Faddition-to-subtract.png&w=1920&q=50)
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