Understanding Tens and Ones: CBSE Class 2 Maths

Hello, little math star! Have you ever wondered how we write big numbers like 25, 47, or 99? It’s like playing with building blocks! In this chapter on Tens and Ones, we will learn the secret code behind all two-digit numbers. Think of 'Ones' as single, loose blocks and 'Tens' as a special bundle made of 10 blocks put together. Understanding this simple idea is the first big step to becoming a math champion. It helps us count, add, and subtract with ease. By the end of this lesson, you will be able to look at any number, like 58, and instantly know that it's made of 5 bundles of ten and 8 single ones. Let's get started on our fun number adventure!

What Are Tens and Ones?

Imagine you have a lot of chocolates. Counting them one by one can take a long time! What if we make groups? This is where Tens and Ones come in.

Ones: These are single items. One chocolate, one pencil, or one car. The numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9 are all 'ones'.

Tens: When we have 10 single items (10 ones), we can group them together to make one 'Ten'. So, 1 Ten is the same as 10 Ones. Think of it like a packet of 10 biscuits.

Every two-digit number has a 'Tens' place and a 'Ones' place. The digit on the right tells you how many single 'ones' you have. The digit on the left tells you how many groups of 'ten' you have. For example, in the number 34, the '4' is in the Ones place, and the '3' is in the Tens place. This means we have 3 Tens and 4 Ones.

Let's Break Down Some Numbers!

  • Example 1: The number 28 Look at the number 28. The digit on the right is 8. The digit on the left is 2. - The '8' is in the Ones place. So, we have 8 Ones. - The '2' is in the Tens place. So, we have 2 Tens. - This means 28 is made of 2 groups of ten and 8 single ones. - So, 28 = 2 Tens + 8 Ones = 20 + 8.
  • Example 2: The number 53 Look at the number 53. The digit on the right is 3. The digit on the left is 5. - The '3' is in the Ones place. So, we have 3 Ones. - The '5' is in the Tens place. So, we have 5 Tens. - This means 53 is made of 5 groups of ten and 3 single ones. - So, 53 = 5 Tens + 3 Ones = 50 + 3.
  • Example 3: The number 40 Look at the number 40. The digit on the right is 0. The digit on the left is 4. - The '0' is in the Ones place. So, we have 0 Ones (no single ones). - The '4' is in the Tens place. So, we have 4 Tens. - This means 40 is made of 4 groups of ten and no single ones. - So, 40 = 4 Tens + 0 Ones = 40 + 0.

Remember These Key Ideas

  • In a two-digit number, the digit on the right is always in the Ones place.
  • The digit on the left is always in the Tens place.
  • One 'Ten' is a special group that always means 10 'Ones'.
  • A number like 16 means 1 Ten and 6 Ones. Be careful not to mix them up!
  • When you write a number in expanded form, like 72 = 70 + 2, you are just showing its Tens and Ones.

Practice Questions with Solutions

  • Q: How many tens and ones are in the number 47? A: Step 1: Look at the number 47. The digit on the right is 7. This is the Ones place. Step 2: The digit on the left is 4. This is the Tens place. Final answer: The number 47 has 4 Tens and 7 Ones.
  • Q: What number is made of 6 Tens and 2 Ones? A: Step 1: 6 Tens means 6 groups of 10. This is equal to 60. Step 2: 2 Ones means 2 single items. This is equal to 2. Step 3: Add them together: 60 + 2 = 62. Final answer: The number is 62.
  • Q: Write the number 85 in its expanded form (Tens + Ones). A: Step 1: Identify the Tens and Ones in 85. The number has 8 Tens and 5 Ones. Step 2: Write the value of the Tens. 8 Tens is 80. Step 3: Write the value of the Ones. 5 Ones is 5. Final answer: The expanded form is 80 + 5.
  • Q: A shopkeeper has 3 bundles of 10 pencils and 9 loose pencils. How many pencils does he have in total? A: Step 1: '3 bundles of 10 pencils' means 3 Tens. This is equal to 30 pencils. Step 2: '9 loose pencils' means 9 Ones. This is equal to 9 pencils. Step 3: Add the tens and ones together: 30 + 9 = 39. Final answer: The shopkeeper has 39 pencils in total.

Frequently Asked Questions

Why do we learn about Tens and Ones?

We learn about Tens and Ones because it helps us understand how bigger numbers are built. It's the first step towards learning addition, subtraction, and multiplication easily.

What if a number is less than 10, like 7?

A number like 7 has only one digit. It fits in the Ones place. So, 7 is made of 0 Tens and 7 Ones.

What is the biggest two-digit number I can make with Tens and Ones?

The biggest two-digit number is 99. It is made of the most tens you can have (9 Tens) and the most ones you can have (9 Ones).