Tens and Ones
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What is Place Value?
Place value tells us what a digit is worth based on where it is in a number. In a two-digit number, we have a tens place and a ones place.
Numbers from 10 to 99 have two digits. The first digit tells us how many groups of ten. The second digit tells us how many ones are left over.
Place Value Words
- Digit - A single number symbol (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)
- Tens place - The left digit in a two-digit number (tells how many groups of 10)
- Ones place - The right digit in a two-digit number (tells how many ones)
Understanding Tens
A group of 10 ones makes 1 ten. Think of it like this:
- 10 = 1 ten and 0 ones
- 20 = 2 tens and 0 ones
- 30 = 3 tens and 0 ones
Picture It!
Think of tens like sticks bundled together. If you have 10 single sticks and tie them with a rubber band, you have 1 bundle of ten!
The number 35 = 3 bundles of ten + 5 single sticks = 3 tens + 5 ones
Examples
Let's break down numbers into tens and ones!
Example 1: What is 24 in tens and ones?
Step 1: Look at the left digit (tens place): 2
Step 2: Look at the right digit (ones place): 4
Answer: 24 = 2 tens and 4 ones
Example 2: What is 50 in tens and ones?
Step 1: Look at the left digit (tens place): 5
Step 2: Look at the right digit (ones place): 0
Answer: 50 = 5 tens and 0 ones
Example 3: 3 tens and 7 ones = ?
Step 1: 3 tens = 30
Step 2: Add the 7 ones: 30 + 7 = 37
Answer: 3 tens and 7 ones = 37
Example 4: What is 18 in tens and ones?
Step 1: Look at the left digit (tens place): 1
Step 2: Look at the right digit (ones place): 8
Answer: 18 = 1 ten and 8 ones
Example 5: 7 tens and 2 ones = ?
Step 1: 7 tens = 70
Step 2: Add the 2 ones: 70 + 2 = 72
Answer: 7 tens and 2 ones = 72
Practice Problems
Try these problems! Write each number in tens and ones, or find the number.
1. What is 45 in tens and ones?
Show Answer
45 = 4 tens and 5 ones
2. What is 62 in tens and ones?
Show Answer
62 = 6 tens and 2 ones
3. 2 tens and 9 ones = ?
Show Answer
2 tens and 9 ones = 29
4. What is 80 in tens and ones?
Show Answer
80 = 8 tens and 0 ones
5. 5 tens and 6 ones = ?
Show Answer
5 tens and 6 ones = 56
6. What is 33 in tens and ones?
Show Answer
33 = 3 tens and 3 ones
7. 9 tens and 1 one = ?
Show Answer
9 tens and 1 one = 91
8. What is 17 in tens and ones?
Show Answer
17 = 1 ten and 7 ones
9. 4 tens and 0 ones = ?
Show Answer
4 tens and 0 ones = 40
10. What is 99 in tens and ones?
Show Answer
99 = 9 tens and 9 ones
Check Your Understanding
Answer these questions to show what you learned!
1. In the number 48, which digit is in the tens place?
Show Answer
The 4 is in the tens place. It means 4 tens or 40.
2. How many ones are in 53?
Show Answer
There are 3 ones in 53. The 3 is in the ones place.
3. Tom has 6 bundles of 10 crayons and 4 single crayons. How many crayons does he have?
Show Answer
6 tens + 4 ones = 64 crayons
4. What number has 7 in the tens place and 0 in the ones place?
Show Answer
The number is 70 (7 tens and 0 ones).
Next Steps
- Practice finding tens and ones in numbers you see every day
- Count objects in groups of 10 at home
- When you are ready, move on to Comparing Numbers
- Great job learning about place value!