Third/Base 10 Blocks
🟦 Count the Blocks: Hundreds, Tens, and Ones
Students count hundreds flats (each worth 100), tens rods (each worth 10), and ones units (each worth 1) to build three-digit numbers. Each question shows a fresh arrangement of Base 10 blocks, reinforcing the structure of the place value system and building the number sense needed for 3-digit addition and subtraction.
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Practice Questions
- 🤔 How many? ?
Show answer
123
- 🤔 How many? ?
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205
- 🤔 How many? ?
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130
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Teacher Resources
Teaching Notes
This is the GR2 extension of Count the Blocks (GR1). Pair with physical Base 10 manipulatives — show students that 10 rods stacked = 1 flat, and 10 flats = 1 thousand. Connect to money: $1 bill (flat), dime (rod), penny (one).
Common Mistakes
- Counting each row of a flat as 10 rather than the whole flat as 100
- Forgetting to include zeros for missing place values (e.g. writing 23 instead of 203)
- Counting the ones before the hundreds — always count largest to smallest
Differentiation
SupportUse a place value chart. Have students write H, T, O columns and fill in each count before writing the final number.
ChallengeAsk students to write the number in expanded form: 234 = 200 + 30 + 4.
Discussion Questions
- How many tens rods equal one hundreds flat?
- If a number has a 0 in the tens place, what does that mean?
- What is the biggest number you can make with 3 flats, 5 rods, and 9 units?
Extension Activities
- Build a 3-digit number with physical blocks and sketch it
- Play "I have, Who has" with hundreds, tens, and ones cards
- Order five 3-digit numbers from least to greatest
Learning Path
Skill Level
intermediate
Estimated Time
15 minutes
Skills Practiced
Three digit number sense