Grade 2/Addition
Add 3 numbers (204)
Grade 2 practice adding three single-digit numbers; encourages grouping for tens.
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Teaching Notes
Guide students to look for pairs of numbers that make ten first (e.g., 7+3=10) as this simplifies the addition process for the third number. Emphasize that the order of addition doesn't change the sum (associative property).
Vocabulary
Addend: A number added in an addition problem.
Sum: The answer to an addition problem.
Common Mistakes
- Forgetting to add all three numbers.
- Making simple addition errors when not grouping efficiently.
- Not recognizing pairs that sum to ten, leading to more complex mental calculations.
Differentiation
SupportProvide manipulatives (e.g., counters, unifix cubes) to physically group numbers. Start with problems where two numbers clearly make ten. Practice adding two numbers before moving to three.
ChallengeIntroduce problems with four single-digit numbers. Encourage mental calculation without writing intermediate steps. Challenge with problems that involve adding a two-digit and two single-digit numbers.
Discussion Questions
- What is a 'friendly ten'? How can finding a friendly ten help us add faster?
- If you change the order of the numbers you add, does the total change? Why or why not?
- Can you think of a real-life situation where you might need to add three numbers together?
Extension Activities
- Group numbers to add easily.
- Use manipulatives for practice.
Parent Tip
Have your child add three small groups of objects together.
Learning Path
Skill Cluster
Number Sense & Operations
Estimated Time
15 minutes
Skills Practiced
adding three numbersassociative propertynumber sense
Prerequisites
- Addition facts to 20
- Adding two single-digit numbers
Next Steps
- Adding three or more 2-digit numbers
- Multi-step addition word problems
- Mental math strategies for sums to 100