What is 10 - 1? | Simple Explanation for Class 1

S1-SA1-1059

What is 10 - 1?

Grade Level:

Class 1

Maths, Computing, AI

Definition

What is it?

10 - 1 means taking away 1 from the number 10. It is a basic subtraction problem, where you find out how much is left when you remove a smaller number from a larger one.

Simple Example

Quick Example

Imagine you have 10 laddoos in a box. If your friend eats 1 laddoo, how many laddoos are left for you? You started with 10, and 1 was taken away, so 10 - 1 will give you the answer.

Worked Example

Step-by-Step

Let's find out what is 10 - 1.
1. Start with the number 10.
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2. We need to take away 1 from 10.
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3. You can count backwards from 10, one step.
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4. If you count back one from 10, you land on 9.
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5. So, 10 - 1 = 9.
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Answer: 9

Why It Matters

Understanding simple subtraction like 10 - 1 is the building block for all higher maths. In computing, it's how computers calculate changes in data or inventory. Future AI systems use these basic operations millions of times to process information, helping in fields like data science and robotics.

Common Mistakes

MISTAKE: Students sometimes think 10 - 1 is 11 by adding instead of subtracting. | CORRECTION: Remember the minus sign '-' means 'take away' or 'subtract', not 'add'.

MISTAKE: Confusing the order and doing 1 - 10. | CORRECTION: Always start with the first number and take away the second number. For 10 - 1, you start with 10.

MISTAKE: Counting incorrectly and getting 8 or 10. | CORRECTION: Double-check your counting. Count back one step carefully from 10.

Practice Questions

Try It Yourself

QUESTION: You have 10 cricket balls and lose 1. How many are left? | ANSWER: 9

QUESTION: If a bus has 10 seats and 1 seat is empty, how many seats are occupied? | ANSWER: 9

QUESTION: Your phone battery is at 10%. If it drops by 1% in the next minute, what is the new battery percentage? | ANSWER: 9%

MCQ

Quick Quiz

What is the result of 10 - 1?

The Correct Answer Is:

10 - 1 means taking one away from ten. Counting backwards one step from 10 gives you 9. Options A, C, and D are incorrect because they either add or don't perform the correct subtraction.

Real World Connection

In the Real World

When you check your mobile data balance, if you had 10 GB and used 1 GB, your phone calculates 10 - 1 to show you 9 GB remaining. Similarly, a shopkeeper calculates change when you pay ₹10 for an item costing ₹1, giving you back ₹9.

Key Vocabulary

Key Terms

SUBTRACTION: Taking one number away from another | MINUS SIGN: The symbol '-' which means to subtract | DIFFERENCE: The answer you get after subtraction | COUNTING BACK: A method to subtract by going backwards on the number line.

What's Next

What to Learn Next

Great job understanding 10 - 1! Next, you can learn about subtracting larger numbers and 'borrowing' in subtraction. These skills will help you solve more complex problems in daily life and in your studies.