Shark Learning
Grade 4/Multiplication

Near 100 Strategies (99, 101, 25×4)

Mental strategies with numbers close to 100 and friendly quadruples of 25.
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Near 100 Strategies (99, 101, 25×4) preview

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#WorksheetQuestionsActions
Easy
1
12 questions
2
12 questions
Medium
1
12 questions
2
12 questions
Hard
1
12 questions
2
12 questions

Practice Questions

  1. 99 × 36 = ?
    Show answer

    3564

  2. 101 × 27 = ?
    Show answer

    2727

  3. 25 × 28 = ?
    Show answer

    700

  4. 99 × 45 = ?
    Show answer

    4455

  5. 101 × 14 = ?
    Show answer

    1414

Teacher Resources
Teaching Notes

These strategies build number sense and mental math fluency. Emphasize the why behind each trick.

Vocabulary
Strategy: A plan to solve a problem.
Compensate: Make up for a difference.
Common Mistakes
  • Subtracting wrong amount for 99×n
  • Forgetting to adjust for 99/101
  • Miscalculating 25x multiples
  • Basic arithmetic errors
  • Not seeing the pattern
Differentiation
SupportProvide multiplication charts for basic facts.
ChallengeChallenge with larger numbers or multiple operations.
Discussion Questions
  • Why does 101 × n = 100 × n + n work?
  • When is the 25 × 4 trick most useful?
  • How do these strategies save time?
  • Can you invent another similar strategy?
Extension Activities
  • Multiply by 101.
  • Use 25 x 4 strategy.
  • Estimate products near 100.
Parent Tip

Ask your child to estimate prices near $100, like $99.

Learning Path
Skill Cluster

Number Sense & Mental Math

Estimated Time

12 minutes

Skills Practiced
Near hundred adjustmentPattern 25x4