IndianTechnoEra: Making Numbers with Tens and Ones

Making Numbers with Tens and Ones

We have learned that two-digit numbers are made using tens and ones. Now we can use this understanding to build numbers.

When we know the number of tens and the number of ones, we can find the complete number.

Learning Objectives

• Build numbers using tens and ones.
• Combine tens and ones to make a number.
• Represent a number in different ways.
• Understand the connection between tens, ones and the total number.

Building a Number

Suppose we have 2 tens and 3 ones.

Two tens make 20 and three ones make 3.

2 tens + 3 ones = 20 + 3 = 23

So, 2 tens and 3 ones make the number 23.

Using Objects

We can use objects to understand how numbers are built.

1 ten and 4 ones

● ● ● ● ● ● ● ● ● ●   ● ● ● ●

10 + 4 = 14

Therefore, one group of ten and four single objects make 14.

Making Different Numbers

3 tens and 2 ones

30 + 2 = 32

4 tens and 6 ones

40 + 6 = 46

5 tens and 1 one

50 + 1 = 51

When There Are No Ones

Sometimes a number has tens but no extra ones.

4 tens + 0 ones = 40

The zero shows that there are no ones.

Making a Number from Its Parts

We can start with a number and find the tens and ones that make it.

36

36 = 3 tens + 6 ones

48

48 = 4 tens + 8 ones

Making Numbers Step by Step

To make a two-digit number:

1. Find the number of tens.
2. Find the number of ones.
3. Make the tens first.
4. Add the ones.
5. Write the complete number.

2 tens + 7 ones

20 + 7 = 27

Common Mistakes

• Adding the digits instead of using their place values.
• Confusing tens with ones.
• Writing the digits in the wrong order.
• Forgetting the value of a ten.

Practice

1. Make a number using 1 ten and 5 ones.

2. Make a number using 2 tens and 8 ones.

3. Make a number using 4 tens and 3 ones.

4. How many tens and ones make 29?

5. How many tens and ones make 50?

Try It Yourself

Use sticks, pencils or blocks. Make groups of ten and then add individual objects to create different two-digit numbers.

3 tens + 5 ones = 35

Quick Revision

• A group of ten has a value of 10.
• Individual objects represent ones.
• Tens and ones combine to make two-digit numbers.
• 2 tens and 3 ones make 23.
• 4 tens and 0 ones make 40.

What Comes Next?

Now that you can build two-digit numbers using tens and ones, you are ready to read and write those numbers correctly.