What's in a Name?

Class 3 · Mathematics

4 ideas in Class 3 Mathematics, explained in plain words, with games and quizzes to practise.

One-to-one Correspondence

Part of: Tracking and Matching

One-to-one correspondence means matching each item with another item or mark. For example, if you have 5 apples and 5 oranges, you can pair each apple with one orange. This helps you count and check that nothing is missing. The cowherd story shows this: they made one mark for each cow leaving and crossed out one mark for each cow returning.

Why it matters. Without a matching system, it is easy to lose track of items and make mistakes. When you count by matching, you never skip an item or count something twice. This skill helps in checking if you have the right amount and solving practical problems like keeping track of items in a shop or children in a class.

Try it in two minutes

Gather 8 to 10 small objects like stones, buttons or coins. Place them in a line on a table.
Now make a chalk mark on paper for each object. Say aloud: 'One mark for this stone, one mark for this button.'
Count the marks and the objects. Do you have the same number of each?
Ask your child: If we remove 2 objects, should we also erase 2 marks? Why?

Try at home. Play a real matching game. Take 6 spoons and 6 bowls. Match each spoon to a bowl. Ask your child: What if we had 7 spoons but only 6 bowls? How many spoons would not have a bowl?

Comparing Lengths of Names

Part of: Comparing and Ordering by Length

Comparing name lengths means counting how many letters each name has and then deciding which name is longer (more letters) or shorter (fewer letters). For example, 'cat' has 3 letters and 'elephant' has 8 letters, so 'elephant' is longer. This teaches children to count carefully and compare quantities.

Why it matters. Comparing helps children understand 'more' and 'less' in a practical way. When they count letters in names, they practice counting and comparing at the same time. This skill builds the foundation for understanding numbers and ordering items by size or length.

Try it in two minutes

Write 3 names on paper: a short one like 'Ann', a medium one like 'Rajesh', and a long one like 'Priyanka'.
Ask your child to count the letters in each name aloud, pointing to each letter.
Ask: Which name has the most letters? Which has the fewest? Which name is longest?
Write another name and ask: How many letters does it have? Is it longer than 'Ann'?

Try at home. Make a list of 5 family members' names. Have your child count the letters in each name and arrange them from shortest to longest. Ask: Can you find a name with exactly 5 letters?

Letters in Number Names

Part of: Number Names and Letter Counts

When we write a number like 43 in words, it becomes 'Forty Three', which has 10 letters (not counting the space). Different numbers have different numbers of letters in their names. Some numbers have the same count of letters even though the numbers are very different. For example, 'Thirteen' and 'Sixty-one' both have the same number of letters.

Why it matters. Exploring number names with letter counts helps children see that numbers have many properties beyond just their size. It makes counting more interesting and helps children think carefully about each letter. This playful approach makes mathematics fun and helps them notice patterns.

Try it in two minutes

Write the number 25 and ask your child to write it in words: 'Twenty Five'.
Count the letters together: t-w-e-n-t-y (5) and f-i-v-e (4). Total: 9 letters.
Now write 34: 'Thirty Four'. Count together: t-h-i-r-t-y (6) and f-o-u-r (4). Total: 10 letters.
Ask: Which number name has more letters, 25 or 34?

Try at home. Pick 5 numbers between 1 and 99. Write them in words and count the letters. Make a list from fewest letters to most letters. Can you find two different numbers with the same number of letters in their names?

Sorting Objects by Properties

Part of: Grouping and Classification

Sorting and grouping means putting objects into categories based on what they have in common. For example, you can group animals by whether they eat food or not, or you can group household items by whether they use electricity. Different objects can be sorted in many different ways depending on what property you choose.

Why it matters. Sorting helps children organize information and think logically. When they group objects, they practice making decisions about what is similar and what is different. This skill is important for understanding categories in science, making lists, and organizing their own belongings. It also helps with early classification skills needed for advanced math.

Try it in two minutes

Gather 10 small items: fruit, toy, button, coin, pencil, shoe, spoon, stick, cloth scrap, stone.
Ask your child: How could we sort these into groups? Let them suggest ways: things you can eat, things that are hard, things you can hold, etc.
Sort by one property together. For example, group into 'things that are smooth' and 'things that are rough'.
Now resort the same objects by a different property. Ask: How many groups do we have now?

Try at home. Go to the kitchen. Find 12 objects and ask your child to sort them three different ways: once by size (big, small), once by use (eating, cooking, cleaning), and once by color. Discuss how the same objects can make different groups.

What your child will practise

Comparing Lengths of Names: Jungle Quick Fire (Quick Fire)
Comparing Lengths of Names: Name Quest (Collect the Answer)
Letters in Number Names: Desert Puzzle (Clue Puzzle)
One-to-one Correspondence: Farm Quest (Collect the Answer)
Sorting Objects by Properties: Treasure Sort Sort (Sort It Out)

Quiz: Comparing Lengths of Names (8 questions)
Quiz: Letters in Number Names (8 questions)
Quiz: One-to-one Correspondence (8 questions)
Quiz: Sorting Objects by Properties (8 questions)