What is 5 × 8?

S1-SA1-0691

Grade Level:

Class 3

Maths, Computing, AI

Definition

What is it?

5 × 8 is a multiplication problem. It means adding the number 5, eight times, or adding the number 8, five times. The '×' symbol means 'multiplied by'.

Simple Example

Quick Example

Imagine you buy 5 packets of biscuits, and each packet has 8 biscuits. To find the total number of biscuits, you would calculate 5 × 8. It helps you quickly find the total without counting each biscuit one by one.

Worked Example

Step-by-Step

Let's find the value of 5 × 8.
1. We can think of 5 × 8 as adding 8 five times.
2. So, it's 8 + 8 + 8 + 8 + 8.
3. First, 8 + 8 = 16.
4. Next, 16 + 8 = 24.
5. Then, 24 + 8 = 32.
6. Finally, 32 + 8 = 40.
---Alternatively---
1. We can also think of 5 × 8 as adding 5 eight times.
2. So, it's 5 + 5 + 5 + 5 + 5 + 5 + 5 + 5.
3. 5 + 5 = 10
4. 10 + 5 = 15
5. 15 + 5 = 20
6. 20 + 5 = 25
7. 25 + 5 = 30
8. 30 + 5 = 35
9. 35 + 5 = 40
Answer: 5 × 8 = 40.

Why It Matters

Understanding multiplication is key in computing and AI, where computers perform millions of calculations every second. It's used by game developers to calculate scores, by data scientists to analyze large datasets, and by engineers to design complex systems, preparing you for future tech careers.

Common Mistakes

MISTAKE: Adding 5 and 8 to get 13. | CORRECTION: Multiplication is repeated addition, not just simple addition. 5 × 8 means 5 added 8 times, or 8 added 5 times.

MISTAKE: Confusing multiplication with division. | CORRECTION: Multiplication finds the total when you have groups of equal size. Division helps you split a total into equal groups.

MISTAKE: Forgetting multiplication tables and trying to count on fingers every time. | CORRECTION: Practice your 5 and 8 times tables regularly. Knowing them by heart makes calculations much faster and easier.

Practice Questions

Try It Yourself

QUESTION: If one auto-rickshaw ride costs 8 rupees per kilometer, how much will 5 kilometers cost? | ANSWER: 40 rupees

QUESTION: A gardener plants 5 rows of marigold flowers, with 8 flowers in each row. How many marigolds are there in total? | ANSWER: 40 marigolds

QUESTION: You have 5 friends, and you want to give each friend 8 chocolates. If you already have 10 chocolates, how many more do you need to buy? | ANSWER: You need 5 × 8 = 40 chocolates. Since you have 10, you need 40 - 10 = 30 more chocolates.

MCQ

Quick Quiz

Which of these is another way to write 5 × 8?

5 + 8

8 + 8 + 8 + 8 + 8

5 ÷ 8

8 - 5

The Correct Answer Is:

Option B (8 + 8 + 8 + 8 + 8) correctly shows 8 added 5 times, which is the definition of 5 × 8. Other options are incorrect operations.

Real World Connection

In the Real World

When you buy groceries online using apps like Zepto or Blinkit, the app calculates the total cost of 5 items if each costs 8 rupees using multiplication. Similarly, cricket statisticians multiply a batsman's runs per over by the number of overs to estimate their score.

Key Vocabulary

Key Terms

MULTIPLICATION: A mathematical operation where a number is added to itself a number of times | PRODUCT: The result of multiplying two or more numbers | TIMES TABLES: A list of multiples for a specific number, used to speed up multiplication | REPEATED ADDITION: Adding the same number multiple times, which is what multiplication does

What's Next

What to Learn Next

Now that you understand 5 × 8, you're ready to explore other multiplication problems and learn your multiplication tables up to 10 or 12. This will help you solve even bigger and more complex math problems quickly!