Counting in Tens - CBSE Class 2 Maths Chapter 4

Understanding Grouping: Tens and Ones

When we count objects, grouping them into tens makes our work very easy. Let's think of a bunch of bananas. If you have 10 single bananas, you can pack them into 1 basket of ten bananas. Here, 1 basket represents 1 Ten, and the remaining individual bananas represent Ones.

Let's take another example. Suppose you have 23 crayons. To count them quickly:

1. Make groups of 10 crayons. You will get exactly 2 groups of ten crayons.
2. You will have 3 crayons left over because they are not enough to make another group of ten.

So, 23 is made of 2 Tens and 3 Ones. Writing numbers this way helps us understand place value. Every time you see a two-digit number, the first digit tells you how many groups of ten you have, and the second digit tells you how many loose single items are left! This is the foundation of learning bigger numbers.

Step-by-Step: How to Count Objects in Tens

1. Gather and Group — Collect all the items you want to count (like sticks, beads, or flowers) and start putting them into packets, groups, or bundles of exactly 10.
2. Count the Tens — Count how many complete bundles of 10 you have made. Each bundle represents '1 Ten'. If you have 4 bundles, that is 4 Tens (which has a value of 40).
3. Count the Leftovers — Count the remaining items that could not make a full bundle of 10. These are your 'Ones' (for example, 7 loose sticks).
4. Combine to Get the Total — Add the Tens and Ones together. 4 Tens (40) + 7 Ones (7) gives you the final count of 47 items!

Exam Tip: Keeping Tens and Ones Separate

A common mistake students make is swapping the positions of Tens and Ones. Always remember: Tens come first (on the left), and Ones come second (on the right)! For example, 5 bundles of 10 and 2 single beads make the number 52, not 25. Remember, the suffix '-ty' in words like thirty (30), forty (40), and fifty (50) represents groups of tens!

Practice Questions with Solutions

• Q: Bunty has 3 packets of crayons with 10 crayons in each packet. He also has 6 loose crayons on his table. How many crayons does Bunty have in total? A: Step 1: Count the packets of tens. Bunty has 3 packets of 10 crayons, which is 3 Tens (30 crayons). Step 2: Count the loose crayons. He has 6 single crayons, which is 6 Ones. Step 3: Combine them together: 30 + 6 = 36 crayons. Final answer: Bunty has 36 crayons in total.
• Q: Rani has 48 shiny beads. She wants to make necklaces. If each necklace needs 10 beads, how many necklaces can she make? How many beads will be left over? A: Step 1: Look at the number 48. Break it into Tens and Ones. Step 2: 48 has 4 Tens and 8 Ones. Step 3: Since each necklace needs 10 beads, 4 Tens means Rani can make 4 necklaces. Step 4: The 8 Ones are the leftover beads that cannot form a full necklace. Final answer: Rani can make 4 necklaces, and 8 beads will be left over.
• Q: There are 5 bundles of sugarcane in a shop. Each bundle has 10 sugarcanes. There are no loose sugarcanes. Write down the total number of sugarcanes. A: Step 1: Count the bundles. There are 5 bundles of 10 sugarcanes, which is 5 Tens. Step 2: Count the loose sugarcanes. There are 0 loose sugarcanes (0 Ones). Step 3: Calculate the total: 5 Tens = 50 sugarcanes. Final answer: The total number of sugarcanes is 50.
• Q: Look at the addition: 7 Tens + 2 Ones. What number does this represent? Write its number name too. A: Step 1: 7 Tens represents the value 70. Step 2: 2 Ones represents the value 2. Step 3: Add them together: 70 + 2 = 72. Step 4: Write the number name for 72, which is 'Seventy-two'. Final answer: The number is 72, and its number name is Seventy-two.

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