Grade 3/Addition
Three-Addend Mental Sums (1- & 2-Digit) (753)
Three addends with a mix of 1- and 2-digit numbers for mental fluency.
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Teacher Resources
Teaching Notes
Have students circle pairs that make ten or hundred.
Common Mistakes
- Forgetting make-ten pairs.
- Miscarrying tens mentally.
- Ignoring mental strategies.
- Adding left-to-right.
Differentiation
SupportUse manipulatives or number lines.
ChallengeAdd more addends or larger numbers.
Discussion Questions
- How do make-ten pairs help simplify addition?
- What other friendly sums did you find?
- Can you explain your mental strategy?
- When is this strategy most useful?
Learning Path
Skill Cluster
Number Sense & Operations
Estimated Time
12 minutes
Skills Practiced
addition mental 3 addends
Prerequisites
- 3
- Adding 1-Digit Numbers
- Making Ten
- Adding Two 2-Digit Numbers
Next Steps
- Adding 3-Digit Numbers (3 Addends)
- Adding Multi-Digit Numbers
- 2-Digit Addition (Regrouping)
- 3-Digit Addition (No Regrouping)
- Mental Math Strategies (Addition)