Grade 2/Subtraction
Subtract Multiples of Ten within 1,000 (261)
Practice subtracting whole tens from whole tens within 0-1,000 to build fluency.
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Quick Tip
Subtracting whole tens helps improve mental math skills.
Teacher Resources
Teaching Notes
Emphasize place value: subtracting tens means subtracting from the tens place, keeping the ones place zero. Use a hundreds chart or number line for visual support. Encourage mental math strategies.
Vocabulary
Multiple of Ten: Numbers like 10, 20, 30, etc.
Place Value: The value of a digit based on its position.
Common Mistakes
- Subtracting from the wrong place value (e.g., subtracting tens from hundreds).
- Forgetting to write the zero in the ones place when subtracting whole tens.
Differentiation
SupportUse base-ten blocks or a hundreds chart to visually represent the subtraction. Start with smaller numbers (within 100).
ChallengeChallenge students to subtract two multiples of ten from a three-digit number that isn't a multiple of ten (e.g., 354 - 20). Introduce estimation.
Discussion Questions
- How is subtracting 30 from 70 like subtracting 3 from 7?
- What happens to the ones digit when we subtract whole tens?
- Can you subtract 40 from 200 without counting? How?
Extension Activities
- Use a hundreds chart.
- Skip count by tens.
- Relate to money (dimes).
Parent Tip
Ask your child to count backward by tens from a number.
Learning Path
Skill Cluster
Number Sense & Place Value
Estimated Time
15 minutes
Skills Practiced
subtracting multiples of tenplace value subtractionthree digit subtraction
Prerequisites
- Counting by 10s to 1,000
- Place value to 1,000
- Subtracting 2-digit multiples of 10
Next Steps
- Subtracting multiples of 100
- Subtracting 2-digit numbers (no regrouping)
- Mental subtraction strategies within 1,000
- Add Multiples of Ten within 1,000
- Subtract Multiples of Hundred within 1,000
- Subtract 2-Digit Numbers from 3-Digit Numbers (No Regrouping)