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Grade 2/Addition

Adding whole tens (3 addends)

Add three whole tens to build confidence with multi-addend sums.
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Easy(Three tens, up to 50)
1
20 questions
2
20 questions
3
20 questions
4
20 questions
Medium(Three tens, up to 90)
1
20 questions
2
20 questions
3
20 questions
4
20 questions
Hard(Three tens, 40–90)
1
20 questions
2
20 questions
3
20 questions
4
20 questions
Prerequisites
Addition: Add Whole Tens - Missing Number6 WS
30 + ______ = 64
What to Do Next
Adding whole tens (3 addends, missing)12 WS
30 + ____ + 10 = 120

Practice Questions

  1. 30 + 80 + 10 = ?
    Show answer

    120

  2. 40 + 20 + 30 = ?
    Show answer

    90

  3. 50 + 30 + 20 = ?
    Show answer

    100

  4. 70 + 10 + 20 = ?
    Show answer

    100

  5. 20 + 40 + 50 = ?
    Show answer

    110

Teacher Resources
Teaching Notes

Teach students to add in pairs: combine first two tens, then add the third. Emphasize counting by tens (30, 50, 90). Model thinking aloud: "I have 3 tens and 2 tens, that's 5 tens or 50. Then add 4 more tens to get 9 tens or 90."

Vocabulary
Addend: A number that is added.
Sum: The total when numbers are added.
Common Mistakes
  • Adding ones place instead of tens
  • Forgetting to add all three numbers
  • Losing track of which numbers were already added
  • Writing 3+2+4=9 instead of 90
  • Forgetting to include the zero in the sum (e.g., 20+30+40=9 instead of 90).
  • Miscounting when summing the 'tens' digits if done mentally.
  • Difficulty tracking multiple addends without visual aids.
Differentiation
SupportUse base-ten blocks or dimes to physically represent the tens. Use a number line for skip-counting by tens. Work with only two addends first.
ChallengeIntroduce four or more multiples of ten. Challenge students with word problems involving adding three whole tens. Ask them to explain their mental strategies.
Discussion Questions
  • How is adding 20 + 30 + 40 similar to adding 2 + 3 + 4?
  • Why is it important to know how to add whole tens quickly?
  • Can you think of a real-life situation where you might add three groups of tens?
Extension Activities
  • Use a calculator to check sums.
  • Create word problems with three addends.
  • Practice adding in reverse order.
Parent Tip

Have your child add three small groups of objects together.

Learning Path
Skill Cluster

Number Sense & Operations: Addition

Estimated Time

15 minutes

Skills Practiced
Adding three whole tensMulti addend additionAssociative property addition