What is 4 × 8?

S1-SA1-0683

Grade Level:

Class 3

Maths, Computing, AI

Definition

What is it?

4 × 8 means adding the number 8 four times, or adding the number 4 eight times. It's a quick way to do repeated addition, which we call multiplication. The symbol '×' stands for 'multiplied by'.

Simple Example

Quick Example

Imagine you have 4 friends, and each friend has 8 ladoos. To find out the total number of ladoos, you would multiply 4 by 8. This tells you how many ladoos there are in all.

Worked Example

Step-by-Step

Let's find the value of 4 × 8.
1. We can think of 4 × 8 as adding 8 four times.
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2. So, we write it as: 8 + 8 + 8 + 8
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3. First, add the first two 8s: 8 + 8 = 16
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4. Now add the next 8: 16 + 8 = 24
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5. Finally, add the last 8: 24 + 8 = 32
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6. So, 4 × 8 = 32.

Alternatively, we can think of it as adding 4 eight times:
1. 4 + 4 + 4 + 4 + 4 + 4 + 4 + 4
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2. 8 + 4 = 12
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3. 12 + 4 = 16
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4. 16 + 4 = 20
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5. 20 + 4 = 24
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6. 24 + 4 = 28
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7. 28 + 4 = 32
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8. So, 4 × 8 = 32.

Why It Matters

Understanding multiplication is key for many fields. In Computing, it helps design efficient algorithms. In AI, it's used in calculations for machine learning models. Engineers and data scientists use multiplication daily to solve complex problems.

Common Mistakes

MISTAKE: Confusing multiplication with addition (e.g., thinking 4 × 8 is 4 + 8 = 12) | CORRECTION: Remember multiplication is repeated addition. 4 × 8 means 8 added 4 times, not just once.

MISTAKE: Not knowing multiplication tables, leading to slow calculations or errors. | CORRECTION: Practice your multiplication tables regularly. Knowing them by heart makes calculations much faster and more accurate.

MISTAKE: Forgetting that the order of numbers in multiplication doesn't change the answer (e.g., thinking 4 × 8 is different from 8 × 4). | CORRECTION: Multiplication is commutative, meaning 4 × 8 is exactly the same as 8 × 4. Both equal 32.

Practice Questions

Try It Yourself

QUESTION: If a bus has 4 wheels, how many wheels do 8 such buses have? | ANSWER: 32 wheels

QUESTION: You bought 4 packets of biscuits, and each packet has 8 biscuits. How many biscuits do you have in total? | ANSWER: 32 biscuits

QUESTION: A gardener plants 4 rows of marigolds. If each row has 8 marigold plants, and then he plants 5 more plants in a new row, what is the total number of marigold plants? | ANSWER: 37 plants (4 × 8 = 32; 32 + 5 = 37)

MCQ

Quick Quiz

What is another way to write 4 × 8?

4 + 8

8 + 8 + 8 + 8

4 + 4 + 4 + 4

The Correct Answer Is:

4 × 8 means adding the number 8 four times, which is 8 + 8 + 8 + 8. Option A is addition, Option C is adding 4 four times, and Option D is just combining the digits.

Real World Connection

In the Real World

When you buy 4 tickets for a movie, and each ticket costs ₹80, the person at the counter quickly calculates the total cost using multiplication (4 × 80). Similarly, if a delivery rider from Swiggy or Zomato makes 4 deliveries, and each delivery takes roughly 8 minutes, they can estimate their total delivery time using multiplication.

Key Vocabulary

Key Terms

Multiplication: A quick way to do repeated addition | Product: The answer to a multiplication problem | Factor: The numbers being multiplied (e.g., in 4 × 8, 4 and 8 are factors) | Times: Another word for 'multiplied by'

What's Next

What to Learn Next

Great job understanding multiplication! Next, you can explore larger multiplication problems and learn about multiplying by 10s and 100s. This will help you solve even bigger real-world math challenges with confidence!