Shark Learning
Grade 2/Subtraction

Adding and Subtracting Three Single-Digit Numbers (268)

Practice adding and subtracting 3 single-digit numbers to improve arithmetic skills.
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Teacher Resources
Lesson Plan

Mixed Addition and Subtraction Strategies

Standards
2.OA.B.2
Printable Aids
Number LineCounters
Teaching Notes

Guide students to solve problems left-to-right, breaking them down into two-step operations. Encourage mental math strategies like making tens or counting on/back. Emphasize basic fact fluency.

Vocabulary
Sum: The result of adding numbers.
Difference: The result of subtracting numbers.
Common Mistakes
  • Incorrect order of operations (not left-to-right)
  • Errors in basic addition/subtraction facts
  • Mismanaging mental steps in multi-part problems
Differentiation
SupportProvide manipulatives (counters, number line) or encourage drawing pictures. Break each problem into two separate two-number problems. Focus on one operation at a time first.
ChallengeIntroduce missing number problems (e.g., 5 + ? - 2 = 6). Challenge with multi-step word problems involving three numbers, or extend to larger single-digit numbers resulting in sums over 20.
Discussion Questions
  • When you have three numbers to add or subtract, what order should you follow?
  • Can you think of a real-life situation where you might add or subtract three numbers?
  • What strategies help you solve these problems quickly in your head?
Extension Activities
  • Use number cards to make your own problems.
  • Try adding first, then subtracting.
Parent Tip

Use small objects like buttons or coins to act out the problems.

Learning Path
Skill Cluster

Number Sense & Operations

Grade Level

2-3

Skills Practiced
adding single digit numberssubtracting single digit numbersorder of operations simple
Prerequisites
  • Basic Addition
  • Basic Subtraction
  • Add two single-digit numbers (sums to 20)
  • Subtract two single-digit numbers (minuends to 20)
  • Basic Addition Facts Fluency
Next Steps
  • Order of Operations
  • Parentheses
  • Add and subtract three 2-digit numbers (no regrouping)
  • Solve 3-number word problems within 20
  • Order of operations with addition and subtraction
  • Adding and Subtracting Two-Digit Numbers (No Regrouping)
  • Solve Multi-Step Word Problems (within 20)