Grade 2/Addition
Addition: Missing Number - Multiples of 100 (433)
Find the missing number when adding multiples of 100. The missing number can be first, second, or the answer. Example: ___ + 200 = 500 (Answer: 300)
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Quick Tip
To find the missing number, subtract the known number from the answer.
Teacher Resources
Teaching Notes
Focus on using place value understanding and the inverse relationship between addition and subtraction. Encourage mental math strategies for multiples of 100.
Vocabulary
Missing Number: A value not shown in an equation.
Sum: The total when numbers are added.
Difference: The result of subtraction.
Common Mistakes
- Confusing the operation needed to find the missing number.
- Errors in skip counting by 100s or basic addition/subtraction facts.
- Not understanding the concept of a missing addend or sum.
Differentiation
SupportUse base-ten blocks or a number line to visualize hundreds.
ChallengeIntroduce problems with larger multiples of 100 or two missing numbers.
Discussion Questions
- What strategies did you use to find the missing number?
- How is finding a missing addend related to subtraction?
- Can you explain why adding hundreds is like adding ones?
- How can you check your answer to make sure it's correct?
Extension Activities
- Find missing numbers.
- Use a number line.
- Work with larger numbers.
Parent Tip
Give your child 5 toys, tell them the total should be 8, and ask how many more are needed.
Learning Path
Skill Cluster
Number Sense and Operations
Estimated Time
15 minutes
Skills Practiced
missing addendssubtraction as inverseaddition fact families
Prerequisites
- Adding multiples of 100
- Understanding place value up to hundreds
- Basic subtraction facts
Next Steps
- Adding and subtracting multiples of 10
- Missing number problems with different operations
- Addition: Add Whole Thousands - Missing Number
- Subtraction: Subtract Whole Hundreds - Missing Number
- Addition: Add Mixed Hundreds - Missing Number