Grade 2/Subtraction
Subtract Multiples of Ten from 2-Digit Numbers
Practice subtracting whole tens from 2-digit numbers to improve accuracy.
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Quick Tip
Subtracting whole tens helps build confidence in subtraction.
Teacher Resources
Teaching Notes
Emphasize place value: subtracting tens affects only the tens digit, the ones digit remains unchanged. Encourage mental math strategies like counting back by tens or using a hundreds chart to visualize.
Vocabulary
Tens digit: The digit in the tens place.
Ones digit: The digit in the ones place.
Common Mistakes
- Incorrectly changing the ones digit (e.g., 54 - 20 = 30 instead of 34).
- Subtracting from the ones digit of the 2-digit number instead of the tens digit.
Differentiation
SupportUse a hundreds chart, number line, or base-ten blocks to model the subtraction concrete-representational-abstract (CRA) approach.
ChallengeChallenge students to subtract whole tens from 3-digit numbers, or estimate differences involving whole tens.
Discussion Questions
- What happens to the ones digit when you subtract a whole ten from a 2-digit number?
- How is subtracting 30 from 75 similar to subtracting 3 from 7?
- Can you think of a real-life situation where you would need to subtract whole tens?
Extension Activities
- Subtract tens on a number line.
- Create your own problems.
Parent Tip
Use coins or blocks to show subtracting groups of ten.
Learning Path
Skill Cluster
Number Sense & Place Value
Estimated Time
15 minutes
Skills Practiced
subtracting multiples of tenplace value understanding
Prerequisites
- Understanding place value (tens and ones)
- Subtracting single-digit numbers
- Counting by tens
Next Steps
- Subtract 2-digit from 2-digit (no regrouping)
- Subtract 2-digit from 2-digit (with regrouping)
- Mental subtraction within 100
- Add whole tens to 2-digit numbers
- Subtract 2-digit numbers without regrouping
- Subtract single-digit from 2-digit numbers