Grade 5/Division
Missing Dividend or Divisor (856)
Use inverse fact families to find missing dividend or divisor.
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Quick Tip
Use inverse facts to find the missing number. Example: __ ÷ 7 = 8 → 56 ÷ 7 = 8; 56 ÷ __ = 8 → 56 ÷ 7 = 8.
Teacher Resources
Teaching Notes
Have students restate as multiplication to solve quickly.
Vocabulary
dividend: The number being divided.
divisor: The number you divide by.
unknown: The missing number or variable.
Common Mistakes
- Choosing dividend instead of divisor
- Incorrect inverse recall
- Confusing dividend and divisor.
- Using incorrect inverse operation.
- Multiplication fact recall errors.
- Basic calculation mistakes.
Differentiation
SupportUse fact families with smaller numbers.
ChallengeSolve multi-step equations with missing values.
Discussion Questions
- How does multiplication help solve division problems?
- What operation finds a missing divisor?
- When is the missing number the dividend?
- Can you write a related fact for this equation?
Extension Activities
- Create your own missing number problems.
- Use a number line to solve.
- Play 'guess the number'.
Parent Tip
Give your child simple word problems with missing numbers to solve.
Learning Path
Skill Cluster
Operations and Algebraic Thinking
Estimated Time
10 minutes
Skills Practiced
inverse relationship
Prerequisites
- Basic Division Facts
- Multiplication Facts
- Understanding of Division
Next Steps
- Division with Remainders
- Multi-Step Division Word Problems
- Algebraic Equations with Division
- Division Fact Families
- Finding Unknown Factors
- Division with Variables