Grade 2/Addition
Add a 2-digit number and a 1-digit number, missing addend (200)
Find the missing 1-digit addend to complete each 2-digit + 1-digit sum. Perfect Grade 2 practice.
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Teacher Resources
Teaching Notes
Emphasize using the relationship between addition and subtraction to find the missing addend. Encourage mental math strategies like counting on or subtracting from the sum. Discuss place value alignment.
Vocabulary
Missing addend: The unknown number in an addition problem.
Sum: The total when numbers are added.
Common Mistakes
- Adding the given numbers instead of finding the difference.
- Incorrectly calculating the difference when subtracting to find the missing addend.
- Misunderstanding which number is the sum versus an addend.
Differentiation
SupportUse a number line, 100-chart, or manipulatives (e.g., base ten blocks) to visualize the addition/subtraction. Provide examples where the missing addend is small.
ChallengeIntroduce problems with larger 2-digit numbers, or challenge students to create their own missing addend problems. Move to missing addends with 2-digit + 2-digit numbers.
Discussion Questions
- How can you use subtraction to help you solve these addition problems?
- What strategy did you use to find the missing number?
- How can you check if your answer is correct?
Extension Activities
- Use fact families.
- Work backward from the sum.
- Use manipulatives.
Parent Tip
Use a number line to find the distance between numbers.
Learning Path
Skill Cluster
Number Sense & Operations
Estimated Time
15 minutes
Skills Practiced
missing addendstwo digit additionsubtraction as inverse
Prerequisites
- Addition facts to 20
- Understanding place value (tens and ones)
- Introduction to inverse operations (addition and subtraction)
Next Steps
- Missing addends with 2-digit + 2-digit numbers
- Missing subtrahends/minuends (subtraction problems)
- Word problems involving missing addends