Numbers From Twenty One to Fifty

Understanding Tens and Ones: Bundles of Ten

To count big numbers up to fifty, we use a very simple trick: grouping! Think of single, loose sticks as ones. When you gather 10 single sticks, you tie them with a band to make 1 bundle of ten.

• 10 Ones = 1 bundle of ten (represented as 10)
• 20 Ones = 2 bundles of ten (represented as 20)
• 30 Ones = 3 bundles of ten (represented as 30)
• 40 Ones = 4 bundles of ten (represented as 40)

When we have extra single sticks left over, we count them as ones. For example, if you have 2 bundles of ten and 3 single sticks, you have 2 Tens and 3 Ones, which makes the number 23 (twenty-three)! This place-value framework helps us build all numbers up to fifty easily.

How to Identify and Write Numbers from 21 to 50

1. Step 1: Count the Bundles of Ten — Look at the groups of ten. Count how many bundles you see. Write down this number first. For example, 3 bundles mean we write '3' in the Tens place.
2. Step 2: Count the Loose Single Sticks — Count the remaining single sticks that are not tied in a bundle. For example, 4 single sticks mean we write '4' in the Ones place.
3. Step 3: Combine the Digits — Put the Tens digit and Ones digit side-by-side. 3 Tens and 4 Ones become the number 34.
4. Step 4: Speak and Write the Number Name — Read the combined number out loud. For 34, we say 'thirty-four'. Write down the number name clearly.

Examples of Building Numbers from 21 to 50

• Number 25 (Twenty-five): 2 bundles of tens (20) + 5 loose ones (5) = 2 Tens and 5 Ones.
• Number 31 (Thirty-one): 3 bundles of tens (30) + 1 loose one (1) = 3 Tens and 1 One.
• Number 40 (Forty): 4 bundles of tens (40) + 0 loose ones (0) = 4 Tens and 0 Ones.
• Number 48 (Forty-eight): 4 bundles of tens (40) + 8 loose ones (8) = 4 Tens and 8 Ones.

Common Mistakes and Writing Tips

1. Mixing up Teen and Ty numbers: Class 1 students often confuse numbers like thirteen (13) with thirty (30) or fourteen (14) with forty (40). Remember, 'teen' numbers have only 1 bundle of ten, while 'ty' numbers like 30 and 40 have 3 and 4 bundles of ten respectively!

2. Writing Tens and Ones Backwards: If a number has 3 Tens and 2 Ones, always write the Tens first. Writing it backwards as 23 instead of 32 changes the number completely! Always count Tens first, then Ones.

Practice Questions with Solutions

• Q: What number is represented by 2 tens and 7 ones? Write its name. A: Step 1: Count the tens. There are 2 tens, which is 20. Step 2: Count the ones. There are 7 ones, which is 7. Step 3: Combine them together to form the number: 27. Final answer: The number is 27 and its name is Twenty-seven.
• Q: If you have 4 bundles of ten sticks and no single sticks, what number do you have? A: Step 1: Count the tens. We have 4 bundles of tens, which is 40. Step 2: Count the ones. Since there are no single sticks, we have 0 ones. Step 3: Combine 4 tens and 0 ones to get 40. Final answer: The number is 40 (Forty).
• Q: Find the missing number: 3 tens and 9 ones = ______. A: Step 1: Identify the tens digit, which is 3. Step 2: Identify the ones digit, which is 9. Step 3: Place them next to each other. 3 tens and 9 ones make 39. Final answer: 39
• Q: Look at the number 45. How many tens and how many ones does it have? A: Step 1: Look at the first digit (left side) which is in the Tens place. It is 4. So, there are 4 tens. Step 2: Look at the second digit (right side) which is in the Ones place. It is 5. So, there are 5 ones. Final answer: 4 tens and 5 ones.

Frequently Asked Questions