Grade 2/Subtraction
Subtract Whole Tens (Missing Number) to 1,000 (262)
Find the missing number in subtraction problems involving whole tens within 0-1,000.
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Quick Tip
Use subtraction to find the missing number.
Teacher Resources
Teaching Notes
Focus on using place value understanding to subtract multiples of ten within 1,000. Guide students to recognize that subtracting tens is similar to subtracting ones, just with an added zero at the end (e.g., 70-30 is like 7-3, then add a zero). Emphasize the inverse relationship between addition and subtraction to find missing numbers.
Vocabulary
Multiple of Ten: Numbers like 10, 20, 30, etc.
Missing Number: A number that is not known or shown.
Common Mistakes
- Confusing the place value of tens when subtracting (e.g., treating 70 as 7).
- Incorrectly applying the inverse operation to find the missing number.
- Making calculation errors with basic tens facts.
Differentiation
SupportUse base ten blocks or a number line to visualize subtracting tens. Start with numbers within 100 or 200. Provide explicit examples of how 70 - ? = 40 relates to 7 - ? = 4.
ChallengeIntroduce word problems that require finding the missing whole ten. Challenge with multi-step problems or finding missing numbers in more complex equations (e.g., ? - 150 = 450 + 100).
Discussion Questions
- How is subtracting 30 from 70 similar to subtracting 3 from 7?
- Why is understanding place value important when we subtract big numbers like 700 and 300?
- If you know 200 + 500 = 700, how can that help you solve 700 - ? = 200?
Extension Activities
- Use a number line.
- Create word problems.
- Use fact families.
Parent Tip
Ask your child to find how many items were taken away from a group ending in zero.
Learning Path
Skill Cluster
Number Sense & Operations
Estimated Time
15 minutes
Skills Practiced
missing number subtractionsubtracting whole tensup to 1000
Prerequisites
- Subtract whole tens within 0-100
- Understanding place value (hundreds, tens, ones)
- Basic subtraction facts
Next Steps
- Subtract any two-digit numbers (without regrouping)
- Subtract whole hundreds (missing number) within 0-1,000
- Subtract any three-digit numbers (without regrouping)
- Add whole tens (find missing number) within 0-1,000
- Subtract whole tens with regrouping within 0-1,000
- Subtract 2-digit numbers (missing number)