Tens: Groups of 10 ones (10, 20, 30...)
Place Value: Where a digit sits tells its value
Base Ten: Our number system uses groups of 10
Worksheets: Structured practice sheets for skill development
Grade 1 Level: Working with numbers up to 100
Number Sense: Understanding relationships between numbers
- Read the instructions: Understand what to do
- Look at the number: Identify the total
- Count tens: How many groups of 10?
- Fill in the blanks: Write answers clearly
- Check your work: Verify answers make sense
20 = ___ tens
30 = ___ tens
50 = ___ tens
Identification: Recognizing tens in numbers
- Look at the number (20)
- Count how many tens (2 tens = 20)
- Write the answer (2)
20 has 2 tens (2 × 10 = 20)
30 has 3 tens (3 × 10 = 30)
50 has 5 tens (5 × 10 = 50)
2×10=20, 3×10=30, 5×10=50 ✓
20 = 2 tens, 30 = 3 tens, 50 = 5 tens
• Counting: Group by tens
• Multiplication: Tens × 10
• Verification: Check answers make sense
2 tens = ___
4 tens = ___
6 tens = ___
Composition: Building numbers from tens
2 tens = 2 × 10 = 20
4 tens = 4 × 10 = 40
6 tens = 6 × 10 = 60
2×10=20, 4×10=40, 6×10=60 ✓
2 tens = 20, 4 tens = 40, 6 tens = 60
• Multiplication: Tens × 10
• Place value: Tens position
• Verification: Check calculations
10 → 1 ten
40 → 4 tens
70 → 7 tens
Matching: Connecting numbers to their tens
10 connects to 1 ten
40 connects to 4 tens
70 connects to 7 tens
All connections are correct!
Successfully matched all numbers to their tens
• Recognition: Identify tens in numbers
• Connection: Link numbers to tens
• Verification: Check matches are correct
Tom has 3 tens of marbles. How many marbles does he have?
Sarah has 50 marbles. How many tens does she have?
If I have 7 tens, how many total do I have?
Application: Using tens in real problems
3 tens = 3 × 10 = 30 marbles
50 ÷ 10 = 5 tens
7 tens = 7 × 10 = 70
3 tens = 3 × 10 = 30 marbles
50 ÷ 10 = 5 tens
7 tens = 7 × 10 = 70
3×10=30, 50÷10=5, 7×10=70 ✓
Tom has 30 marbles, Sarah has 5 tens, answer is 70
• Word problems: Identify key information
• Problem solving: Apply tens concepts
• Checking: Verify solutions make sense
80 = ___ tens
9 tens = ___
What number has 3 tens?
60 = ___ tens
Mastery: Comprehensive review of tens concepts
80 = 8 tens (8 × 10 = 80)
9 tens = 90 (9 × 10 = 90)
3 tens = 30 (3 × 10 = 30)
60 = 6 tens (6 × 10 = 60)
8×10=80, 9×10=90, 3×10=30, 6×10=60 ✓
Successfully completed all tens problems
• Review: Apply all learned concepts
• Flexibility: Switch between operations
• Mastery: Demonstrate complete understanding