Shark Learning
Grade 5/Multiplication

Estimate Products (Compatible Numbers)

Build reasonableness checks by estimating products with compatible numbers.
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Easy
1
12 questions
2
12 questions
Medium
1
12 questions
2
12 questions
Hard
1
12 questions
2
12 questions

Practice Questions

  1. 46 × 19 ≈ ?
    Show answer

    1000

  2. 72 × 28 ≈ ?
    Show answer

    2000

  3. 39 × 61 ≈ ?
    Show answer

    2400

  4. 84 × 17 ≈ ?
    Show answer

    1700

  5. 58 × 42 ≈ ?
    Show answer

    2400

Teacher Resources
Teaching Notes

Emphasize choosing numbers easy to multiply mentally. Highlight estimation as a way to check exact answers.

Vocabulary
Estimate: Find an approximate answer.
Compatible Numbers: Numbers that are easy to compute with.
Common Mistakes
  • Over-rounding both factors too far
  • Rounding incorrectly.
  • Choosing non-compatible numbers.
  • Multiplying original numbers.
  • Confusing estimate with exact answer.
Differentiation
SupportFocus on rounding to the nearest ten first.
ChallengeInclude larger numbers or more factors.
Discussion Questions
  • Why is estimating products useful?
  • How do compatible numbers help?
  • When might an estimate be better than an exact answer?
  • What makes a number 'friendly' for estimation?
Extension Activities
  • Estimate products with larger numbers.
  • Compare estimates to exact answers.
  • Use rounding to nearest 10.
Parent Tip

Ask your child to estimate the cost of 6 items at $3.95 each.

Learning Path
Skill Cluster

Number Sense

Estimated Time

10 minutes

Skills Practiced
Round then multiplyMagnitude reasoning