What is 5 x 9? | Simple Explanation for Class 3

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What is 5 × 9?

Grade Level:

Class 3

Maths, Computing, AI

Definition

What is it?

5 × 9 is a multiplication problem asking us to find the total when the number 9 is added 5 times, or when the number 5 is added 9 times. It represents finding the product of 5 and 9.

Simple Example

Quick Example

Imagine you have 5 friends, and each friend eats 9 gulab jamuns at a party. To find out the total number of gulab jamuns eaten, you would multiply 5 by 9.

Worked Example

Step-by-Step

Let's find the value of 5 × 9 using repeated addition.

Step 1: Understand that 5 × 9 means adding the number 9, five times.

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Step 2: Start adding: 9

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Step 3: Add 9 again: 9 + 9 = 18

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Step 4: Add 9 again: 18 + 9 = 27

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Step 5: Add 9 again: 27 + 9 = 36

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Step 6: Add 9 one last time: 36 + 9 = 45

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So, 5 × 9 = 45.

Why It Matters

Understanding multiplication is key for many advanced topics in Maths, Computing, and even AI. Knowing your multiplication tables helps in programming calculations, analyzing data for AI models, and even designing algorithms. Engineers, data scientists, and game developers use multiplication every day.

Common Mistakes

MISTAKE: Confusing multiplication with addition, e.g., thinking 5 × 9 = 5 + 9 = 14. | CORRECTION: Remember multiplication is repeated addition. 5 × 9 means 9 added 5 times, not just 9 plus 5.

MISTAKE: Forgetting the order of numbers doesn't change the product, e.g., thinking 5 × 9 is different from 9 × 5. | CORRECTION: The commutative property of multiplication states that 5 × 9 is the same as 9 × 5. Both give the same answer.

MISTAKE: Not knowing the multiplication table for 5 or 9 and guessing. | CORRECTION: Practice your multiplication tables regularly. Knowing them by heart makes calculations much faster and more accurate.

Practice Questions

Try It Yourself

QUESTION: A auto-rickshaw driver charges Rs. 9 for every kilometer. How much will he charge for a 5 km ride? | ANSWER: Rs. 45

QUESTION: If you have 5 boxes, and each box contains 9 laddoos, what is the total number of laddoos? | ANSWER: 45 laddoos

QUESTION: A mobile game gives you 9 points for collecting a coin. If you collect 5 coins in each of 2 rounds, how many total points do you have? | ANSWER: 90 points (5 coins x 2 rounds = 10 coins total. 10 coins x 9 points/coin = 90 points)

MCQ

Quick Quiz

Which of the following expressions is equivalent to 5 × 9?

5 + 9

9 + 9 + 9 + 9 + 9

5 + 5 + 5 + 5 + 5

5 × 5 × 5 × 5 × 5 × 9

The Correct Answer Is:

5 × 9 means adding the number 9 five times. Option B correctly shows 9 added to itself five times. Options A and C are incorrect forms of multiplication, and D is an incorrect exponential form.

Real World Connection

In the Real World

When you are shopping online and want to buy 5 items, each costing Rs. 9, your UPI app quickly calculates the total bill as Rs. 45 using multiplication. Similarly, in cricket analytics, if a batsman scores 9 runs in 5 different overs, multiplication helps quickly find his total runs from those overs.

Key Vocabulary

Key Terms

MULTIPLICATION: A mathematical operation that represents repeated addition. | PRODUCT: The result of a multiplication problem. | FACTORS: The numbers being multiplied together. | REPEATED ADDITION: Adding the same number multiple times, which is what multiplication does.

What's Next

What to Learn Next

Great job understanding 5 × 9! Next, you should explore other multiplication tables like 6 × 7 or 8 × 4. Building a strong foundation in multiplication will help you tackle division and fractions with ease!