Grade 4/Subtraction
Missing Tens in 3-Digit Subtraction (460)
Find what multiple of 10 was subtracted from a 3-digit number. Students apply place value reasoning to solve missing number problems.
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Teaching Notes
This collection helps students develop strong place value reasoning by focusing on the tens digit. Encourage mental math strategies to identify the missing multiple of 10.
Vocabulary
Tens place: The digit representing multiples of ten.
Multiple of 10: A number that can be divided by 10.
Common Mistakes
- Not focusing on the tens place, attempting full subtraction.
- Incorrectly calculating the difference in tens.
- Confusing the tens digit with the actual value of the multiple of 10.
Differentiation
SupportUse base ten blocks or a number line to visualize the change.
ChallengeChallenge with missing hundreds or thousands, or more digits.
Discussion Questions
- How does the tens place change when you subtract a multiple of 10?
- Can you solve this without regrouping or borrowing?
- What if the ones digit wasn't zero in the numbers?
- How is this skill useful in everyday mental math?
Extension Activities
- Skip count by tens.
- Use base-ten blocks.
- Identify tens in numbers.
Parent Tip
Practice counting by tens forward and backward.
Learning Path
Skill Cluster
Number Sense & Place Value
Estimated Time
15 minutes
Skills Practiced
missing tens subtractionplace value tensskip counting
Prerequisites
- Place Value to Hundreds
- Subtracting Multiples of 10 (2-Digit)
- Basic Subtraction within 100
Next Steps
- Subtracting Multiples of 100 (3-Digit)
- Mental Subtraction of 3-Digit Numbers
- Missing Numbers in Addition/Subtraction
- Find Missing Hundreds in 3-Digit Subtraction
- Subtract Multiples of 100 from 3-Digit Numbers
- Mental Subtraction with 3-Digit Numbers