Number Names for 2-Digit Numbers
Number names for 2-digit numbers means writing numbers from 10 to 99 in words. In Class 2, you practise reading and spelling these names correctly.
If you know the names for tens (twenty, thirty, forty ...) and ones (one, two, three ...), you can write any 2-digit number name.
What is Number Names for 2-Digit Numbers - Class 2 Maths (Place Value)?
A 2-digit number name is how we write a number from 10 to 99 using words.
Tens names to remember:
| Number | Name |
|---|---|
| 10 | Ten |
| 20 | Twenty |
| 30 | Thirty |
| 40 | Forty |
| 50 | Fifty |
| 60 | Sixty |
| 70 | Seventy |
| 80 | Eighty |
| 90 | Ninety |
Rule: For numbers like 25, combine the tens name and ones name: Twenty + Five = Twenty-five.
Special names (11 to 19): Eleven, Twelve, Thirteen, Fourteen, Fifteen, Sixteen, Seventeen, Eighteen, Nineteen. These do NOT follow the tens + ones pattern.
Solved Examples
Example 1: Write the Number Name
Question: Write the name for 37.
Think:
- Tens digit = 3 → Thirty
- Ones digit = 7 → Seven
Answer: 37 = Thirty-seven
Example 2: Write the Number from the Name
Question: Write the number for "Fifty-four".
Think:
- Fifty = 50
- Four = 4
- 50 + 4 = 54
Answer: 54
Example 3: Special Number (11-19)
Question: Write the name for 16.
Think:
- Numbers 11 to 19 have special names
- 16 = Sixteen (not "ten-six")
Answer: 16 = Sixteen
Example 4: Round Tens Number
Question: Write the name for 80.
Think:
- 8 tens and 0 ones
- 80 = Eighty
Answer: 80 = Eighty
Example 5: Word Problem — Roll Number
Question: Kavi's roll number is forty-three. Write it as a number.
Think:
- Forty = 40
- Three = 3
- 40 + 3 = 43
Answer: Kavi's roll number is 43.
Example 6: Comparing Number Names
Question: Which is bigger — sixty-eight or eighty-six?
Think:
- Sixty-eight = 68
- Eighty-six = 86
- 86 > 68
Answer: Eighty-six (86) is bigger.
Example 7: Common Spelling Mistake
Question: Which is the correct spelling — "Fourty" or "Forty"?
Think:
- The correct spelling is F-O-R-T-Y
- "Fourty" is WRONG even though the number is four
Answer: The correct spelling is Forty.
Key Points to Remember
- Numbers 11 to 19 have special names (eleven, twelve, thirteen ...).
- For 20 to 99, combine the tens name and ones name with a hyphen: thirty-five, sixty-two.
- Round tens (20, 30, 40 ...) just have the tens name: twenty, thirty, forty.
- Tricky spellings: Forty (not fourty), Twelve (not tweleve), Eight (silent 'gh').
- Practise writing number names to avoid spelling mistakes.
Practice Problems
- Write the number name for 56.
- Write the number for "Seventy-nine".
- Write the names for 11, 12, 13, 14, and 15.
- Which is correct: "Fourty" or "Forty"?
- Ria's age is twenty-three. Write it as a number.
- Write the number names for 90, 91, 92, 93.
Frequently Asked Questions
Q1. How do I write number names for 2-digit numbers?
For numbers 20-99, combine the tens name with the ones name. For example, 47 = Forty-seven. Numbers 11-19 have special names you must memorise.
Q2. Why are numbers 11 to 19 special?
They have unique names that do not follow the tens + ones pattern. You cannot say 'one-teen' for 11 — it is 'eleven'. These names come from old English words.
Q3. Is it 'forty' or 'fourty'?
The correct spelling is 'forty'. Even though the number is four, the 'u' is dropped when writing forty.
Q4. Do I use a hyphen in number names?
Yes. Use a hyphen between the tens and ones parts: twenty-one, thirty-five, ninety-nine. Round tens like twenty or fifty do not need a hyphen.
Q5. What is the biggest 2-digit number name?
The biggest 2-digit number is 99, written as ninety-nine.
Q6. What is the smallest 2-digit number name?
The smallest 2-digit number is 10, written as ten.
Q7. How do I remember the spelling of tricky number names?
Write each name 5 times and say it aloud. The tricky ones are: eight (silent gh), twelve (not tweleve), forty (not fourty), fifteen (not fiveteen).
