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 notebook

No prior knowledge is required for this lesson.

Activities

1. Warm-up: Counting to 20

   Start by counting from 1 to 20 together. Then, challenge yourself to count backwards from 20 to 1.

2. Introduction to Number Bonds

   Explain to your student that number bonds show the relationship between numbers. In this lesson, we will focus on number bonds to 20, which means finding pairs of numbers that add up to 20.

3. Number Bond Practice

   Ask your student to write down the number 20 at the top of their paper. Then, together, find different number bonds for 20. For example, they can write down 10 + 10, 15 + 5, or 12 + 8.

4. Number Bond Challenge

   Now, give your student a number between 1 and 19 and ask them to find the missing number in the number bond that adds up to 20. For example, if you say "12", they should write down 12 + ___ = 20.

5. Number Bond Puzzles

   Create number bond puzzles for your student to solve. Draw circles or squares to represent the missing parts of the number bonds. For example, draw a circle with "10" inside and ask your student to find the missing number that completes the bond: ___ + 10 = 20.

First Grade Talking Points

• "Number bonds are a way to show how numbers are related to each other."
• "Today, we are going to focus on number bonds to 20, which means finding pairs of numbers that add up to 20."
• "Let's practice finding different number bonds for 20. For example, we can have 10 + 10, 15 + 5, or 12 + 8."
• "Now, I will give you a number between 1 and 19. Your task is to find the missing number in the number bond that adds up to 20."
• "Let's solve some number bond puzzles. I will draw circles or squares to represent the missing parts of the number bonds, and you need to find the missing numbers."