Addition: Add Three 1-Digit Numbers (424)

Teaching Notes

Focus on using the 'make 10' strategy to efficiently add three single-digit numbers. Encourage mental math and number sense development.

Vocabulary

Addends: Numbers being added together.

Sum: The total result of addition.

Common Mistakes

• Not looking for pairs that make 10.
• Incorrect basic addition facts.
• Adding strictly left-to-right without seeking strategies.

Differentiation

Discussion Questions

• How can finding a 'make 10' pair help you add faster?
• Can you think of another strategy to add three numbers?
• When might it be useful to add three numbers in real life?
• Does the order you add the numbers change the sum? Why or why not?

Extension Activities

• Use manipulatives to add three numbers.
• Find patterns when adding three numbers.

Parent Tip

Count items in groups: 2 red blocks, 3 blue, 1 green.

Skill Cluster

Number Sense and Operations

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Adding two 1-digit numbers
• Number combinations that make 10

Next Steps

• Adding three 1-digit and 2-digit numbers
• Adding multiple 2-digit numbers
• Adding Two 1-Digit Numbers
• Adding Two 2-Digit Numbers
• Mental Math: Make 10