Objective

By the end of this lesson, you will be able to understand and apply number bonds to 20.

Materials and Prep

• Pen or pencil
• Blank paper or a notebook

No prior knowledge or preparation is required for this lesson.

Activities

1. Start by writing the number 20 on your paper.

   Next, draw a large circle around the number 20.

   Now, imagine that the circle represents the total number of objects you have.

   Think of two numbers that you can add together to make 20. Write those numbers outside the circle.

   For example, you can write 10 and 10 outside the circle.

   Draw lines connecting the numbers outside the circle to the number 20 inside the circle.

   These lines represent the number bonds between the two numbers and 20.

2. Repeat the previous activity, but this time, choose different numbers that add up to 20.

   For example, you can choose 15 and 5.

   Draw the number bonds connecting the numbers to 20.

3. Now, it's time to test your understanding.

   Write down a number outside the circle and try to find the missing number that, when added to it, will make 20.

   For example, if you write 13 outside the circle, what number should be inside the circle to complete the number bond?

   Try to find as many number bonds as you can!

First Grade Talking Points

• "Number bonds help us understand how numbers can be added together to make a larger number."
• "In our first activity, we drew a circle around the number 20 to represent the total number of objects we have."
• "We then thought of two numbers that we can add together to make 20 and wrote them outside the circle."
• "By drawing lines connecting those numbers to 20, we created number bonds."
• "In the second activity, we did the same thing, but with different numbers that add up to 20."
• "Finally, we tested our understanding by writing a number outside the circle and finding the missing number that completes the number bond."
• "Number bonds help us see the relationship between numbers and how they can be combined."