Grade 5/Addition
Addition: Adding Multiples of Ten to 2-Digit Numbers (426)
Add multiples of 10 to 2-digit numbers. Practice mental math with tens. Example: 20 + 39 = 59
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Quick Tip
When adding tens, think about the tens place first, then add any ones.
Teacher Resources
Teaching Notes
Focus on using place value and mental math strategies to add multiples of ten. Encourage students to see the pattern of the tens digit changing while the ones digit remains constant.
Vocabulary
Multiple of Ten: A number that can be divided by ten with no remainder.
Place Value: The value of a digit based on its position.
Common Mistakes
- Adding the tens multiple to the ones digit instead of the tens digit.
- Miscalculating the tens sum, especially when crossing a hundred.
- Forgetting to maintain the original ones digit in the sum.
Differentiation
SupportUse number lines or base-ten blocks to visualize place value changes.
ChallengeAdd multiples of 10 to 3-digit numbers or solve multi-step problems.
Discussion Questions
- How does adding a multiple of ten change a 2-digit number?
- What happens to the ones digit when you add a whole ten?
- Why is it useful to be able to add tens mentally?
- How is adding 30 to 45 similar to adding 3 to 4?
Extension Activities
- Add multiples of ten to 100.
- Use base-ten blocks.
- Skip count by tens.
Parent Tip
Ask your child to count by tens to a target number.
Learning Path
Skill Cluster
Number Sense & Place Value
Estimated Time
15 minutes
Skills Practiced
adding multiples of tenadding 2 digit numbersplace value understanding
Prerequisites
- Place Value: Tens and Ones
- Addition to 20
- Adding 10 to a 2-Digit Number
Next Steps
- Adding 2-Digit Numbers (No Regrouping)
- Adding Multiples of Ten to 3-Digit Numbers
- Addition: Adding 2-Digit Numbers (No Regrouping)
- Addition: Adding Multiples of Ten to 3-Digit Numbers
- Subtraction: Subtracting Multiples of Ten from 2-Digit Numbers