🧱 Tens and Ones – Building Numbers Step by Step

Imagine numbers are made of small building blocks. Some blocks are small (ones), and some are bigger (tens). When we put them together, we can build any number!

📌 What are Ones?

Ones are single units. Each object counts as one.

Example:

🍎 = 1 🍎🍎 = 2 🍎🍎🍎 = 3

📌 What are Tens?

A ten is a group of 10 ones.

Example:

10 = 1 ten 20 = 2 tens

🧠 How Numbers Are Built

Every number greater than 9 is made of tens and ones.

Examples:

🏗 Build the Number

Let’s build numbers like a construction game!

  1. 1 ten + 4 ones = ___
  2. 2 tens + 3 ones = ___
  3. 3 tens + 0 ones = ___
  4. 1 ten + 9 ones = ___
  5. 2 tens + 7 ones = ___

🔍 Break the Number

Now do the opposite — break numbers into tens and ones.

  1. 14 = ___ tens and ___ ones
  2. 25 = ___ tens and ___ ones
  3. 30 = ___ tens and ___ ones
  4. 19 = ___ tens and ___ ones
  5. 21 = ___ tens and ___ ones

🎯 Challenge Round

Think carefully!

  1. Which number has 2 tens and 5 ones?
  2. Which number has 1 ten and 0 ones?
  3. Which number has 3 tens and 2 ones?
  4. Which number has 0 tens and 7 ones?

📘 Answers

Build the Number

  1. 14
  2. 23
  3. 30
  4. 19
  5. 27

Break the Number

  1. 1 ten, 4 ones
  2. 2 tens, 5 ones
  3. 3 tens, 0 ones
  4. 1 ten, 9 ones
  5. 2 tens, 1 one

Challenge Round

  1. 25
  2. 10
  3. 32
  4. 7

💡 Final Message

Great job! Now you understand how numbers are built. Tens and ones are the foundation of all bigger numbers.

Once you master this, addition and subtraction become much easier.

⬅ Back to Ordinal Numbers

Math is like building — strong basics make everything easier!

Download Free Worksheet

Download a printable worksheet to practice tens and ones at home or in the classroom.

Download PDF Worksheet
⬅ Ordinal Numbers