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Second/Base 10 Blocks

🟦 Count the Blocks: Tens and Ones

Students count Base 10 rods (each worth 10) and unit cubes (each worth 1), then write the two-digit number they represent. Every question shows a fresh visual arrangement of blocks, building number sense and laying the groundwork for addition and subtraction with regrouping.
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WorksheetsTeacher InfoLearning Path

Preview

🟦 Count the Blocks: Tens and Ones preview

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Prerequisites
🔢 Compare Two Numbers: Tens and Ones6 WS
34 ___ 21

Practice Questions

  1. 🤔 How many? ?
    Show answer

    23

  2. 🤔 How many? ?
    Show answer

    30

  3. 🤔 How many? ?
    Show answer

    15

  4. 🤔 How many? ?
    Show answer

    57

Teacher Resources
Teaching Notes

This worksheet pairs perfectly with physical Base 10 manipulatives. Have students build the number shown before writing it. For struggling students, encourage them to touch each rod and count by tens out loud before adding the ones. Connect to real-life: dimes (tens) and pennies (ones) reinforce the same concept.

Common Mistakes
  • Counting each segment of a rod as 1 instead of the whole rod as 10
  • Forgetting to count the ones after counting the tens
  • Writing the ones digit first (e.g. writing 32 instead of 23)
  • Losing count when there are many units — use the illustration's 5-per-row grouping
Differentiation
SupportProvide physical Base 10 blocks to match the worksheet pictures. Let students count by ones on the rods (point to each segment) until they build confidence counting by 10s.
ChallengeAsk students to write the number in expanded form (20 + 3 = 23) and circle whether the number is odd or even.
Discussion Questions
  • How do you know which blocks are worth more?
  • What is the biggest number you can make with 3 rods and 5 units?
  • If you had 14 ones cubes, how could you trade some for rods?
  • Can two different pictures of blocks ever show the same number? Why or why not?
Extension Activities
  • Have students draw their own block arrangements for numbers 1–99
  • Play "I have, Who has" with Base 10 block cards
  • Use a hundreds chart to locate and colour each answer
  • Challenge: find two different block arrangements that make the same number (impossible — discuss why!)
Learning Path
Skill Level

beginner

Estimated Time

12 minutes

Skills Practiced
Tens and ones readingTwo digit number sense