What is 3 × 9?

S1-SA1-0675

Grade Level:

Class 2

Maths, Computing, AI

Definition

What is it?

3 × 9 means adding the number 9 three times, or adding the number 3 nine times. It is a basic multiplication problem that helps us quickly find the total when we have equal groups.

Simple Example

Quick Example

Imagine you have 3 friends, and each friend eats 9 ladoos. To find out how many ladoos they ate in total, you would calculate 3 × 9. It helps you quickly count without adding each ladoo one by one.

Worked Example

Step-by-Step

Let's find the answer to 3 × 9:
1. We can think of 3 × 9 as adding 9 three times.
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2. So, we write it as: 9 + 9 + 9
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3. First, add the first two 9s: 9 + 9 = 18
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4. Now, add the last 9 to this sum: 18 + 9 = 27
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5. So, 3 × 9 equals 27.
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Alternatively, you can think of it as 3 added 9 times:
1. 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3 + 3
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2. This also gives the same answer: 27.
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Answer: 27

Why It Matters

Understanding multiplication like 3 × 9 is crucial for everyday calculations and forms the base for advanced concepts. In computing, it's used in algorithms for data processing; in AI, it helps in calculations for machine learning models. Careers in software development, data science, and even logistics rely on quick mental math and multiplication skills.

Common Mistakes

MISTAKE: Adding 3 and 9 to get 12 | CORRECTION: Multiplication (×) means repeated addition, not just simple addition (+). You need to add 9 three times, or 3 nine times.

MISTAKE: Confusing 3 × 9 with 9 ÷ 3 | CORRECTION: The '×' symbol means multiply. Division (÷) is the opposite operation, used to split into equal groups.

MISTAKE: Forgetting the multiplication tables and guessing the answer | CORRECTION: Practice your multiplication tables regularly. Knowing them by heart makes these calculations much faster and more accurate.

Practice Questions

Try It Yourself

QUESTION: If a rickshaw driver charges ₹9 for a short ride, how much would he earn from 3 such rides? | ANSWER: ₹27

QUESTION: A gardener plants 3 rows of marigolds, with 9 marigolds in each row. How many marigolds did he plant in total? | ANSWER: 27 marigolds

QUESTION: Your favourite mobile game gives you 9 coins for completing a level. If you complete 3 levels every day for 3 days, how many coins will you have? | ANSWER: 81 coins (3 levels/day * 9 coins/level = 27 coins/day. Then 27 coins/day * 3 days = 81 coins)

MCQ

Quick Quiz

Which of the following expressions is equivalent to 3 × 9?

3 + 9

9 + 9 + 9

9 - 3

3 + 3 + 3

The Correct Answer Is:

Option B (9 + 9 + 9) correctly represents 3 multiplied by 9, which means adding 9 three times. Options A, C, and D represent different operations or incorrect repeated addition.

Real World Connection

In the Real World

From calculating the total cost of 3 packets of biscuits at ₹9 each in a kirana store, to figuring out how many players are on 3 cricket teams (if each team has 9 players), multiplication is used everywhere. Even delivery apps like Zomato use multiplication to calculate total order value when you buy multiple items.

Key Vocabulary

Key Terms

MULTIPLICATION: A quick way to do repeated addition | PRODUCT: The answer to a multiplication problem | TIMES: Another word for 'multiply' or 'groups of' | REPEATED ADDITION: Adding the same number multiple times

What's Next

What to Learn Next

Great job understanding 3 × 9! Next, you should explore other multiplication facts, like 4 × 7 or 6 × 8. Mastering these will make you super fast with numbers and ready for bigger challenges like multi-digit multiplication and division.