Why We Count in Groups of Ten
Long ago, people needed to count many things. They counted sheep, fruits, and tools. Using their ten fingers helped them keep track! When they ran out of fingers, they made groups of ten. This is why we use numbers like 10, 20, 30, and so on.
Today, we still use this idea of counting in tens. When we see numbers like 23 or 47, we can tell exactly how many groups of ten they have. This helps us understand big numbers better!
What Are Tens and Ones?
Every number from 10 to 90 has two important parts. The tens digit tells us how many groups of ten we have. The ones digit tells us how many single things are left over.
Tens Place
Ones Place
Reading Left to Right
See the Tens and Ones
Look at the picture above! The tens digit is always the first number you see. In 45, the tens digit is 4. This means we have 4 groups of ten things. The ones digit is 5, which means 5 things are left by themselves.
How Place Value Works
Every spot in a number has a special job. We call these spots place value. The place tells us how much each digit is really worth!
When we want to find the tens digit in any number from 10 to 90, we just look at the first digit! That first digit tells us exactly how many groups of ten we have.
Tens Digit Patterns
Look at the cool patterns! All numbers that start with 2 have 2 tens. All numbers that start with 5 have 5 tens. The first digit you see always tells you how many groups of ten are hiding inside the number!
Finding the Tens Digit Step by Step
Let's practice finding the tens digit in the number 84. We'll go through it step by step so you can see exactly how to do it!
Easy Ways to Remember
| Helpful Trick | Example | Why It Works |
|---|---|---|
| Look Left First! | In 56, look left and see 5 | We read numbers from left to right, just like words |
| Cover the Last Digit | Cover the 3 in 73, see 7 | The tens digit is what's left when you hide the ones |
| Count by Tens | For 42: 10, 20, 30, 40... that's 4 tens! | Counting by tens shows you how many groups you have |
Moving to Bigger Numbers
Once you know how to find the tens digit in numbers like 10-90, you're ready for even bigger numbers! Numbers can have hundreds, thousands, and more places too!
| What You Know Now | What's Coming Next |
|---|---|
| Reading tens digit in 2-digit numbers (10-99) | Reading hundreds digit in 3-digit numbers (100-999) |
| Understanding 'tens place' and 'ones place' | Learning 'hundreds place,' 'thousands place,' and more! |
| Numbers like 25, 47, 83 | Numbers like 125, 347, 1,283 |
The great news is that the same left-to-right reading trick works for all numbers! You'll always read digits from left to right to figure out what each place is worth.
Practice Problems
Reading the Tens Digit in 10–90
Reading the tens digit is easy once you know the trick! The first digit you see when reading from left to right is always the tens digit. This digit tells you how many groups of ten are hiding inside the number. In 47, the tens digit is 4, which means 4 groups of ten. In 83, the tens digit is 8, which means 8 groups of ten.
Remember that every two-digit number has a tens place and an ones place. The tens digit shows complete groups of ten, while the ones digit shows leftover single items. This pattern helps us understand how numbers work and makes counting easier. Now you can read the tens digit in any number from 10 to 90!