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Fourth/Addition

Add a 2-digit and 1-digit number, no regrouping

Add a 1-digit number to a 2-digit number without regrouping. Great for Grade 2 mental addition.
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Add a 2-digit and 1-digit number, no regrouping preview

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Practice Questions

  1. 34 + 4 = ?
    Show answer

    38

  2. 52 + 3 = ?
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    55

  3. 27 + 2 = ?
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    29

  4. 61 + 7 = ?
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    68

  5. 45 + 4 = ?
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    49

Teacher Resources
Teaching Notes

Emphasize adding ones to ones and tens to tens. Encourage students to visualize place value blocks or use mental math strategies like counting on from the 2-digit number for efficiency.

Vocabulary
Place value: Value of a digit based on its position.
Regrouping: Exchanging tens for ones or vice versa.
Common Mistakes
  • Incorrectly adding the 1-digit number to the tens digit of the 2-digit number.
  • Not recognizing the need for place value alignment when adding.
  • Simple calculation errors with basic facts.
Differentiation
SupportProvide manipulatives (base ten blocks, number lines) to model the addition. Start with smaller 2-digit numbers (e.g., 10-29).
ChallengeChallenge with sums greater than 100 (e.g., 92 + 5) or introduce simple 2-digit + 1-digit regrouping problems as an extension.
Discussion Questions
  • How does knowing your basic addition facts help you add bigger numbers quickly?
  • What's a fast mental strategy you can use to add a small number to a two-digit number?
  • Why is it important to pay attention to the ones place and the tens place when you add?
Extension Activities
  • Use a place value chart.
  • Draw the numbers.
  • Use manipulatives.
Parent Tip

Use base-ten blocks to show adding ones and tens.

Learning Path
Skill Cluster

Number Sense & Addition Strategies

Estimated Time

15 minutes

Skills Practiced
Adding ones digitAdding tens digitPlace value understanding