Grade 3/Addition
Addition: Complete Whole Thousands (434)
Find the missing number to make a whole thousand (2,000, 3,000, etc.). Example: 7,300 + ___ = 9,000 (Answer: 1,700)
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Quick Tip
To find what completes a thousand, subtract the starting number from the target thousand.
Teacher Resources
Teaching Notes
Encourage students to use number bonds to 100 or 1000. Discuss strategies like 'counting up' or 'subtracting back from the whole thousand'.
Vocabulary
Whole Thousand: A number like 1000, 2000, 3000.
Target: The goal number to reach.
Common Mistakes
- Incorrectly regrouping tens or hundreds when subtracting.
- Confusing the concept of a 'whole thousand' (e.g., 8,000) with other multiples.
- Making calculation errors during mental subtraction for larger numbers.
Differentiation
SupportUse a number line or base-ten blocks to visualize the missing part.
ChallengeSolve problems involving multiple steps or larger whole numbers.
Discussion Questions
- What strategies can you use to find the missing number quickly?
- How does knowing number bonds to 10 help you with bonds to 1,000?
- Can you think of a real-life situation where completing a whole thousand would be useful?
- If the starting number was 5,250, what would be the missing number to reach 6,000?
Extension Activities
- Complete other thousands.
- Use base-ten blocks.
- Add two thousands.
Parent Tip
Tell your child you have $1000 saved and want $2000 total. Ask how much more is needed.
Learning Path
Skill Cluster
Number Sense & Operations
Estimated Time
15 minutes
Skills Practiced
missing addendswhole thousandssubtraction fluency
Prerequisites
- Addition and subtraction within 1,000
- Place value to thousands
- Number bonds to 10 and 100
Next Steps
- Subtraction across zeros
- Estimation and rounding to thousands
- Multi-digit addition with regrouping
- Addition: Complete Whole Hundreds
- Subtraction: Across Zeros - Set B
- Mental Math: Addition & Subtraction Within 10,000