Activities on Understanding Tens and Ones in Grade 1

Master understanding tens and ones: place value, base ten system, number recognition through these 5 detailed activities designed for young learners.

Tens and Ones: Rules and Methods
🔟 Understanding Tens & Ones 🔟
10
Ten = 10 ones
1
One = 1 unit
15
1 ten + 5 ones
Key Definitions:

Tens: Groups of 10 ones (10, 20, 30...)

Ones: Individual units (1, 2, 3...)

Place Value: Where a digit sits tells its value

Base Ten: Our number system uses groups of 10

Number = (Tens × 10) + Ones
Place Value Formula
Step-by-Step Method:
  1. Look at the number: Identify the total
  2. Find the tens: Count groups of 10
  3. Find the ones: Count remaining units
  4. Write the breakdown: Number = tens + ones
Tip 1: Count by tens first (10, 20, 30...)
Tip 2: Use your hands to group into tens!
Tip 3: Say "___ tens and ___ ones" aloud.
Important: Every number can be broken into tens and ones.
Remember: 10 ones = 1 ten.
Activity: Numbers 1-3
1 Identifying Tens
Activity 1
Look at the number 20. How many tens and ones does it have?
Definition:

Tens: Groups of 10 ones

Method:
  1. Look at the number (20)
  2. Count how many groups of 10 (2 groups)
  3. Count remaining ones (0 ones)
  4. Write as: 20 = 2 tens + 0 ones
10
10
Number
20
Tens
2
Ones
0
Step 1: Look at the number

We have the number 20

Step 2: Count groups of 10

How many groups of 10 are in 20? 2 groups of 10

Step 3: Count remaining ones

After taking out 20 (2×10), we have 0 left over

Step 4: Write the breakdown

20 = 2 tens + 0 ones

20 = 2 tens + 0 ones
Final answer:

20 has 2 tens and 0 ones

Applied rules:

• Grouping: Count by tens first

• Place value: Tens and ones positions

• Division: 20 ÷ 10 = 2 tens

2 Identifying Ones
Activity 2
Look at the number 17. How many tens and ones does it have?
Definition:

Ones: Individual units that don't make a full group of 10

10
1
1
1
1
1
1
1
Number
17
Tens
1
Ones
7
Step 1: Look at the number

We have the number 17

Step 2: Take out groups of 10

How many tens are in 17? Only 1 group of 10

Step 3: Count remaining ones

After taking out 10, we have 7 ones left

Step 4: Write the breakdown

17 = 1 ten + 7 ones

17 = 1 ten + 7 ones
Final answer:

17 has 1 ten and 7 ones

Applied rules:

• Subtraction: 17 - 10 = 7

• Remainder: Leftover after grouping by 10

• Place value: Tens and ones positions

3 Mixed Practice
Activity 3
Break apart these numbers: 25, 34, 41. How many tens and ones in each?
Definition:

Mixed practice: Applying concepts to various numbers

25
2T+5O
34
3T+4O
41
4T+1O
Step 1: Analyze first number (25)

25 = 2 tens (20) + 5 ones (5)

Step 2: Analyze second number (34)

34 = 3 tens (30) + 4 ones (4)

Step 3: Analyze third number (41)

41 = 4 tens (40) + 1 one (1)

Step 4: Verify all answers

20+5=25, 30+4=34, 40+1=41 ✓

25=2T+5O, 34=3T+4O, 41=4T+1O
Final answer:

25: 2 tens + 5 ones, 34: 3 tens + 4 ones, 41: 4 tens + 1 one

Applied rules:

• Systematic approach: Work left to right

• Verification: Check each answer

• Pattern recognition: Tens digit, ones digit

Activity: Numbers 4-5
4 Building Numbers
Activity 4
If you have 3 tens and 6 ones, what number do you make?
Definition:

Building numbers: Composing from tens and ones

10
10
10
1
1
1
1
1
1
Given
3T+6O
Calculate
30+6
Result
36
Step 1: Identify what you have

You have 3 tens and 6 ones

Step 2: Calculate the value of tens

3 tens = 3 × 10 = 30

Step 3: Calculate the value of ones

6 ones = 6 × 1 = 6

Step 4: Add them together

30 + 6 = 36

3 tens + 6 ones = 36
Final answer:

3 tens and 6 ones make the number 36

Applied rules:

• Multiplication: Tens × 10

• Addition: Combine tens and ones

• Composition: Parts make whole number

5 Puzzle Challenge
Activity 5
I am a number with 4 tens and fewer than 5 ones. My ones digit is even. What number am I?
Definition:

Puzzle solving: Using clues to find the number

Tens
4
Ones
0,2,4
Possible
40,42,44
Step 1: Identify the tens

4 tens = 40 (so our number starts with 4)

Step 2: Find possible ones

Ones must be even and less than 5: 0, 2, or 4

Step 3: List possible numbers

40, 42, or 44

Step 4: Any could be correct

All three satisfy the conditions!

Possible answers: 40, 42, or 44
Final answer:

The number could be 40, 42, or 44 (all have 4 tens, even ones, less than 5)

Applied rules:

• Logical reasoning: Process of elimination

• Number properties: Even, less than

• Place value: Tens and ones positions

Understanding Tens and Ones: Complete Guide

What Are Tens and Ones?

Tens are groups of 10 ones. When you have 10 individual units, we bundle them together to make 1 ten.

Ones are individual units that don't make a full group of 10.

Why Learn This?

Understanding tens and ones is the foundation of our number system! It helps with:

  • Addition and subtraction with larger numbers
  • Understanding place value
  • Reading and writing numbers correctly
  • Mental math strategies

The Base Ten System

  • Our number system uses 10 digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • Each place is 10 times bigger than the one before: ones, tens, hundreds...
  • 10 ones = 1 ten
  • 10 tens = 1 hundred

Visual Tools

Base Ten Blocks: Long rods = 10, small cubes = 1
Grouping Objects: Bundling 10 straws together
Number Lines: Jumping by tens and ones

How to Identify Tens and Ones

Look at the position of each digit:

  1. Rightmost digit: Always the ones place
  2. Next digit to the left: Always the tens place
  3. Example: In 37, 7 is in ones place, 3 is in tens place

Examples of Tens and Ones

  • 12 = 1 ten + 2 ones
  • 25 = 2 tens + 5 ones
  • 30 = 3 tens + 0 ones
  • 47 = 4 tens + 7 ones
  • 50 = 5 tens + 0 ones

Real World Applications

  • 23 apples = 2 tens (20) + 3 ones (3) = 23
  • 34 students = 3 tens (30) + 4 ones (4) = 34
  • $45 = 4 tens ($40) + 5 ones ($5) = $45

Key Strategies for Success

  • Count by tens first: 10, 20, 30, 40...
  • Then count ones: 31, 32, 33, 34...
  • Use visual aids: Draw dots in groups of 10
  • Practice with objects: Count actual items

Common Mistakes to Avoid

  • Mixing up tens and ones positions
  • Not recognizing when there are zero ones
  • Forgetting that 10 ones = 1 ten
  • Counting incorrectly when bundling by 10

Questions & Answers

Question: Why do we need to learn about tens and ones? Can't we just count regular numbers?

Answer: Great question! Learning about tens and ones helps us understand how numbers work, just like learning the alphabet helps us read words!

  • It makes adding and subtracting much easier: 23 + 15 becomes (20 + 10) + (3 + 5) = 30 + 8 = 38
  • It helps us understand bigger numbers later: knowing 23 = 2 tens + 3 ones helps with 234 = 2 hundreds + 3 tens + 4 ones
  • It makes mental math faster and more accurate

Think of it like organizing your toys: it's easier to count and find what you need when things are grouped together!

Question: My child is getting confused between tens and ones. How can I help them keep them straight?

Answer: Use visual and tactile aids to make the difference clear!

  • Use different colored objects: red for tens, blue for ones
  • Use base ten blocks: long rods for tens, small cubes for ones
  • Draw large circles for tens, small dots for ones
  • Point to the rightmost digit and say "ones", then move left and say "tens"

Practice daily with small numbers first (11-19) since these clearly show the tens + ones pattern. Make it a game!

Question: What are some effective activities to reinforce tens and ones understanding?

Answer: Make it hands-on and engaging!

  • Base Ten Block Towers: Build structures and identify tens/ones
  • Number Card Sorts: Match numbers to tens + ones representations
  • Place Value Puzzles: Pieces showing different ways to make numbers
  • Grouping Games: Bundle 10 objects to make "tens"
  • Place Value Charts: Fill in tens and ones columns

The key is repeated practice through varied, fun activities rather than repetitive worksheets!