Tens and Ones
Every two-digit number is made of tens and ones. A ten is a group of 10 things. Ones are the leftover single things.
For example, if you have 13 beads, you can make 1 group of 10 and have 3 left over. So 13 = 1 ten + 3 ones.
What is Tens and Ones - Class 1 Maths (Numbers 10 to 20)?
Place value tells us what each digit in a number means.
- The digit on the left tells the number of tens.
- The digit on the right tells the number of ones.
| Number | Tens | Ones |
|---|---|---|
| 10 | 1 | 0 |
| 14 | 1 | 4 |
| 18 | 1 | 8 |
| 20 | 2 | 0 |
Tens and Ones Formula
Number = (Tens × 10) + Ones
Solved Examples
Example 1: Tens and Ones in 12
Question: How many tens and ones in 12?
Think:
- 12 = 1 group of 10 + 2 left over
- Tens digit = 1, Ones digit = 2
Answer: 12 = 1 ten and 2 ones.
Example 2: Tens and Ones in 17
Question: Break 17 into tens and ones.
Think:
- 17 = 1 ten + 7 ones
- Tens = 1, Ones = 7
Answer: 17 = 1 ten and 7 ones.
Example 3: Make a Number from Tens and Ones
Question: 1 ten and 5 ones make which number?
Think:
- 1 ten = 10
- 5 ones = 5
- 10 + 5 = 15
Answer: 1 ten + 5 ones = 15.
Example 4: How Many Tens in 20?
Question: How many tens are in 20?
Think:
- 20 = 2 groups of 10
- Tens = 2, Ones = 0
Answer: 20 has 2 tens and 0 ones.
Example 5: Ria's Crayons
Question: Ria has 16 crayons. She puts them in groups of 10. How many groups of 10 and how many left over?
Think:
- Make 1 group of 10 crayons
- 6 crayons are left over
Answer: 1 group of 10 and 6 left over. So 16 = 1 ten + 6 ones.
Example 6: What is the Tens Digit?
Question: In the number 19, what is the tens digit?
Think:
- 19 has two digits: 1 and 9
- The left digit (1) is the tens digit
- The right digit (9) is the ones digit
Answer: The tens digit is 1.
Example 7: Grouping with Sticks
Question: Aman has 10 sticks. He ties them into 1 bundle. Then he has 3 more loose sticks. What number does this show?
Think:
- 1 bundle = 1 ten = 10
- 3 loose sticks = 3 ones
- 10 + 3 = 13
Answer: This shows the number 13.
Key Points to Remember
- 10 ones make 1 ten.
- In a two-digit number, the left digit is the tens place and the right digit is the ones place.
- To find tens and ones, group objects into sets of 10 and count leftovers.
- Number = (Tens × 10) + Ones. Example: 1 ten + 6 ones = 10 + 6 = 16.
- Numbers 10 to 19 all have 1 ten. The number 20 has 2 tens.
Practice Problems
- How many tens and ones in 11?
- 1 ten + 8 ones = which number?
- What is the ones digit in 15?
- Priya has 10 marbles in a bag and 4 in her hand. What number is that?
- Break 20 into tens and ones.
- How many ones are in the number 10?
Frequently Asked Questions
Q1. What are tens and ones?
Tens and ones are place values. The tens digit tells how many groups of 10 are in a number. The ones digit tells how many single units are left over.
Q2. How many ones make one ten?
10 ones make 1 ten. When you group 10 single objects together, you get one group of ten.
Q3. What is the tens digit in 14?
The tens digit in 14 is 1. The ones digit is 4.
Q4. Why do we learn tens and ones?
Tens and ones help us understand how numbers are built. This makes adding and subtracting bigger numbers easier.
Q5. How many tens are in 10?
10 has exactly 1 ten and 0 ones. It is the first number with a tens digit.
Q6. Is the number 9 made of tens and ones?
9 is a single-digit number. It has 0 tens and 9 ones. Two-digit numbers (10 and above) start having tens.
