What is 8 - 1? | Simple Explanation for Class 1

S1-SA1-1044

What is 8 - 1?

Grade Level:

Class 1

Maths, Computing, AI

Definition

What is it?

8 - 1 means taking away 1 from the number 8. It is a basic subtraction problem where you find the difference between two numbers.

Simple Example

Quick Example

Imagine you have 8 yummy ladoos. If you eat 1 ladoo, how many are left? You started with 8, took away 1, so 7 ladoos are remaining.

Worked Example

Step-by-Step

Let's find out what is 8 - 1 using counting back.
1. Start with the number 8.
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2. We need to subtract 1, which means we count back one step from 8.
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3. If you count back one number from 8, you land on 7.
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4. So, 8 - 1 = 7.

Why It Matters

Understanding subtraction is super important for Maths and even for future careers in Computing and AI. Engineers use it to calculate distances, and data scientists use it to compare values. It's a foundational skill for problem-solving.

Common Mistakes

MISTAKE: Counting forward instead of backward. For example, some might think 8 - 1 is 9. | CORRECTION: When you subtract, you always count backward or remove items from a group.

MISTAKE: Getting confused by the order and doing 1 - 8. | CORRECTION: Always subtract the second number from the first number. The order matters in subtraction.

MISTAKE: Forgetting to subtract anything and just writing the first number. For example, thinking 8 - 1 is 8. | CORRECTION: Always perform the subtraction operation. Taking away 1 means the number will become smaller.

Practice Questions

Try It Yourself

QUESTION: What is 7 - 1? | ANSWER: 6

QUESTION: If you have 9 pencils and give 1 to your friend, how many pencils do you have left? | ANSWER: 8 pencils

QUESTION: A bus has 10 seats. If 1 seat is empty, and then 1 more person gets off, how many people are on the bus? (Hint: First find how many people were there, then subtract again) | ANSWER: 8 people

MCQ

Quick Quiz

What is the result of 8 minus 1?

The Correct Answer Is:

Subtracting 1 from 8 means taking one away, which leaves 7. Options A, C, and D are incorrect as they don't represent taking one away from 8.

Real World Connection

In the Real World

Imagine you're checking your mobile data. If you started with 8 GB of data and used 1 GB for watching videos, you'd quickly calculate 8 - 1 = 7 GB remaining. Many apps on your phone use subtraction for things like showing remaining battery or game scores.

Key Vocabulary

Key Terms

SUBTRACT: To take away one number from another. | DIFFERENCE: The result you get when you subtract one number from another. | MINUS: A symbol (-) that means to subtract. | COUNTING BACK: A method of subtraction where you count backwards from the first number.

What's Next

What to Learn Next

Great job with basic subtraction! Next, you can learn about subtracting larger numbers or subtracting zero. These concepts build on what you've learned today and will make you even better at mental math!