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Third/Subtraction

Subtract Multiples of Ten from 2-Digit Numbers

Practice subtracting whole tens from 2-digit numbers to improve accuracy.
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Study Guide

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Practice Questions

  1. 45 - 20 = ?
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    25

  2. 58 - 30 = ?
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    28

  3. 72 - 40 = ?
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    32

  4. 65 - 50 = ?
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    15

  5. 84 - 60 = ?
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    24

Quick Tip
Subtracting whole tens helps build confidence in subtraction.
Teacher Resources
Teaching Notes

Emphasize place value: subtracting tens affects only the tens digit, the ones digit remains unchanged. Encourage mental math strategies like counting back by tens or using a hundreds chart to visualize.

Vocabulary
Tens digit: The digit in the tens place.
Ones digit: The digit in the ones place.
Common Mistakes
  • Incorrectly changing the ones digit (e.g., 54 - 20 = 30 instead of 34).
  • Subtracting from the ones digit of the 2-digit number instead of the tens digit.
Differentiation
SupportUse a hundreds chart, number line, or base-ten blocks to model the subtraction concrete-representational-abstract (CRA) approach.
ChallengeChallenge students to subtract whole tens from 3-digit numbers, or estimate differences involving whole tens.
Discussion Questions
  • What happens to the ones digit when you subtract a whole ten from a 2-digit number?
  • How is subtracting 30 from 75 similar to subtracting 3 from 7?
  • Can you think of a real-life situation where you would need to subtract whole tens?
Extension Activities
  • Subtract tens on a number line.
  • Create your own problems.
Parent Tip

Use coins or blocks to show subtracting groups of ten.

Learning Path
Skill Cluster

Number Sense & Place Value

Estimated Time

15 minutes

Skills Practiced
Subtracting multiples of tenPlace value understanding