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What is 8 × 9?
Grade Level:
Class 3
Maths, Computing, AI
Definition
What is it?
8 × 9 means adding the number 8 nine times, or adding the number 9 eight times. It is a basic multiplication problem that helps us find the total when we have equal groups.
Simple Example
Quick Example
Imagine you have 8 friends, and each friend eats 9 ladoos. To find out the total number of ladoos eaten, you would multiply 8 by 9. This gives you the total number of ladoos.
Worked Example
Step-by-Step
Let's find the answer to 8 × 9 step-by-step:---Step 1: Understand that 8 × 9 means 8 groups of 9, or 9 groups of 8.---Step 2: You can count by 9s, 8 times: 9, 18, 27, 36, 45, 54, 63, 72.---Step 3: Or, you can count by 8s, 9 times: 8, 16, 24, 32, 40, 48, 56, 64, 72.---Step 4: Using the multiplication table for 8, you know that 8 multiplied by 9 is 72.---Answer: 8 × 9 = 72.
Why It Matters
Understanding multiplication is key for many advanced topics in Maths and even Computing. Engineers use it to calculate forces, while game developers use it for scoring and animations. It's a fundamental skill for problem-solving in science and technology.
Common Mistakes
MISTAKE: Adding 8 and 9 to get 17. | CORRECTION: Multiplication is repeated addition, not single addition. 8 × 9 means adding 8 nine times, or 9 eight times.
MISTAKE: Confusing 8 × 9 with 8 + 9 or 8 - 9. | CORRECTION: Each operation (addition, subtraction, multiplication) has a different meaning. Multiplication (×) means combining equal groups.
MISTAKE: Forgetting the multiplication tables and guessing the answer. | CORRECTION: Practice your multiplication tables regularly. Knowing them by heart makes calculations much faster and more accurate.
Practice Questions
Try It Yourself
QUESTION: A vendor sells 8 bouquets, and each bouquet has 9 roses. How many roses are there in total? | ANSWER: 72 roses
QUESTION: If you read 9 pages of a book every day, how many pages will you read in 8 days? | ANSWER: 72 pages
QUESTION: You have 8 boxes, and each box contains 9 cricket balls. If 5 balls are lost from one box, how many balls are left in total? | ANSWER: First, find total balls: 8 x 9 = 72. Then subtract lost balls: 72 - 5 = 67 balls.
MCQ
Quick Quiz
What is the product of 8 and 9?
17
72
64
81
The Correct Answer Is:
B
The product of 8 and 9 is found by multiplying them, which is 72. Options A, C, and D are incorrect values for this multiplication.
Real World Connection
In the Real World
When you buy 8 packets of biscuits, and each packet costs 9 rupees, you quickly calculate 8 × 9 = 72 rupees using multiplication. Similarly, delivery apps like Swiggy or Zomato use multiplication to calculate the total cost of multiple identical items in your order.
Key Vocabulary
Key Terms
Multiplication: Repeated addition of the same number | Product: The result of multiplying two or more numbers | Factors: The numbers you multiply together to get a product | Times: Another word for multiplication, as in '8 times 9'
What's Next
What to Learn Next
Now that you've mastered 8 × 9, try learning other multiplication facts like 7 × 6 or 12 × 5. This will strengthen your number sense and prepare you for division and more complex math problems.
