Grade 1/Subtraction
Find the Missing Tens (458)
Find what multiple of 10 was subtracted from a 2-digit number. Students strengthen place value understanding and practice mental math strategies.
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Teaching Notes
This activity strengthens mental math by focusing on how subtracting multiples of ten affects only the tens digit of a 2-digit number. It reinforces place value understanding and subtraction strategies.
Vocabulary
Tens place: The digit representing multiples of ten.
Multiple of 10: A number that can be divided by 10.
Common Mistakes
- Ignoring the ones digit when it's not zero.
- Incorrectly subtracting tens (e.g., 7 - 3 = 5).
- Confusing addition with subtraction.
Differentiation
SupportUse base-10 blocks or a number line for visual support.
ChallengeSolve problems with three-digit numbers or two missing tens.
Discussion Questions
- How does subtracting multiples of ten affect the ones digit?
- How does it affect the tens digit?
- What strategy helps you find the missing number quickly?
- Explain how to solve 92 - ___ = 42.
Extension Activities
- Skip count by tens.
- Use base-ten blocks.
- Identify tens in numbers.
Parent Tip
Count by tens together to practice number patterns.
Learning Path
Skill Cluster
Number Sense & Operations
Estimated Time
15 minutes
Skills Practiced
missing tens subtractionplace value tensskip counting
Prerequisites
- Understanding place value (tens and ones)
- Subtracting single-digit numbers
- Identifying multiples of 10
Next Steps
- Subtracting any 2-digit number
- Subtracting multiples of 100
- Estimating differences to the nearest ten
- Subtracting Multiples of 10 from Three-Digit Numbers
- Missing Part Subtraction within 100
- Mental Math: Subtracting Tens