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Grade 2/Addition

Adding whole tens (4 addends)

Add four whole tens to reinforce larger structured sums.
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Easy(Four tens, up to 50)
1
20 questions
2
20 questions
3
20 questions
4
20 questions
Medium(Four tens, up to 90)
1
20 questions
2
20 questions
3
20 questions
4
20 questions
Hard(Four tens, 40–90)
1
20 questions
2
20 questions
3
20 questions
4
20 questions
Prerequisites
Adding whole tens (3 addends, missing)12 WS
30 + ____ + 10 = 120
What to Do Next
Adding whole tens (4 addends, missing)12 WS
30 + ____ + 10 + 20 = 140

Practice Questions

  1. 30 + 80 + 10 + 20 = ?
    Show answer

    140

  2. 20 + 40 + 30 + 10 = ?
    Show answer

    100

  3. 50 + 20 + 10 + 30 = ?
    Show answer

    110

  4. 40 + 30 + 20 + 10 = ?
    Show answer

    100

  5. 60 + 20 + 10 + 10 = ?
    Show answer

    100

Teacher Resources
Teaching Notes

Introduce pairing strategy: add numbers that make friendly sums (like two 50s). Show multiple approaches: left to right, pairing compatible numbers, or making tens. This builds flexibility in mental math strategies.

Vocabulary
Whole tens: Numbers like 10, 20, 30, ending in zero.
Addend: A number added in an addition problem.
Common Mistakes
  • Losing track of all four numbers
  • Adding only three numbers
  • Making calculation errors with larger sums
  • Not organizing numbers strategically
  • Forgetting to carry over or group tens correctly when adding larger sums.
  • Miscounting when skip-counting by tens.
  • Treating the '0' in tens as an additional addend instead of recognizing the value of the 'ten' unit.
Differentiation
SupportProvide base ten blocks or a number line to visualize adding tens. Start with two or three addends before moving to four. Encourage grouping pairs of tens first.
ChallengeChallenge students to add five or more multiples of ten. Introduce missing addend problems (e.g., 20 + ? + 30 + 10 = 90). Discuss efficient mental strategies.
Discussion Questions
  • How is adding multiples of ten similar to adding single-digit numbers?
  • What strategy did you use to add the tens quickly?
  • If you had 10 tens, how much would that be? How does this relate to place value?
Extension Activities
  • Add 5 whole tens.
  • Add 3 whole tens.
  • Use base-ten blocks.
Parent Tip

Have your child count groups of 10 objects, then combine the groups.

Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

15 minutes

Skills Practiced
Adding whole tensMultiple addendsAddition properties