Grade 1/Base 10 Blocks
🔢 Compare Two Numbers: Tens and Ones
Students compare two two-digit numbers and write >, <, or = to show the relationship. By looking at the tens digit first and the ones digit when tens are equal, students build the foundation for number ordering — key skills for addition, subtraction, and mental math.
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Teaching Notes
Teach students to always compare tens first. Use a number line or hundreds chart to visually confirm answers. The hungry alligator mnemonic for > and < is widely used and effective for GR1.
Common Mistakes
- Comparing ones digits before tens digits
- Confusing > and < direction — remind them the open side faces the bigger number
- Forgetting to compare ones when tens are equal
Differentiation
SupportUse a place value chart. Have students write each number in a tens/ones chart before comparing.
ChallengeHave students write a sentence explaining their answer: "34 > 21 because 3 tens is more than 2 tens."
Discussion Questions
- How do you know which number is bigger without counting all the way?
- Can a number with more ones still be smaller than a number with fewer ones?
- What does it mean when two numbers are equal?
Extension Activities
- Write three numbers and order them from least to greatest
- Play "war" with number cards — flip two, compare, winner takes both
- Find examples in real life (prices, temperatures, scores)
Learning Path
Skill Level
beginner
Estimated Time
12 minutes
Skills Practiced
Number comparison two digit