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First/Subtraction

Mental Subtraction: Tens & Hundreds

Subtract whole tens and hundreds; includes harder variants.
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Practice Questions

  1. 720 − 50 = ?
    Show answer

    670

  2. 720 − 350 = ?
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    370

  3. 7,400 − 1,100 = ?
    Show answer

    6300

  4. 7,458 − 1,100 = ?
    Show answer

    6358

  5. 4,600 − 300 = ?
    Show answer

    4300

Teacher Resources
Teaching Notes

Use base-10 language (tens/hundreds).

Vocabulary
Whole tens: Numbers like 10, 20, 30.
Whole hundreds: Numbers like 100, 200, 300.
Common Mistakes
  • borrow where not needed
  • Misaligning place values.
  • Forgetting to regroup mentally.
  • Errors with zero place holders.
  • Confusing addition with subtraction.
Differentiation
SupportUse manipulatives or number lines for visualization.
ChallengeSolve multi-step problems mentally; estimate differences.
Discussion Questions
  • What strategies help subtract mentally?
  • How does place value change?
  • When is mental subtraction useful?
  • Can you explain your method?
Extension Activities
  • Subtracting thousands.
  • Adding whole tens/hundreds.
  • Number line jumps.
Parent Tip

Ask your child to subtract multiples of 10 or 100 from a number.

Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

10 minutes

Skills Practiced
Subtract multiples 10 100