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What is 10 - 8?
Grade Level:
Class 1
Maths, Computing, AI
Definition
What is it?
10 - 8 means taking away 8 from 10. It is a basic subtraction problem where you find the difference between two numbers. The result tells you how many are left after you remove a certain amount.
Simple Example
Quick Example
Imagine you have 10 laddoos for a festival. If you eat 8 of them, how many laddoos are left? This is exactly what 10 - 8 helps you find out.
Worked Example
Step-by-Step
Let's find out what 10 - 8 is using a number line:
1. Start at the number 10 on your number line.
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2. Since we are subtracting 8, we need to move 8 steps backwards (to the left).
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3. Take the first step back: 10 -> 9
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4. Take the second step back: 9 -> 8
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5. Continue taking steps back until you have moved 8 steps in total: 8 -> 7 -> 6 -> 5 -> 4 -> 3 -> 2
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6. After moving 8 steps back from 10, you land on the number 2.
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So, 10 - 8 = 2.
Why It Matters
Understanding basic subtraction like 10 - 8 is crucial for everyday problem-solving and forms the bedrock for advanced concepts in Maths, Computing, and AI. It's used by software developers to manage inventory, by data scientists to compare values, and by AI engineers to fine-tune algorithms. Many careers, from shopkeepers to scientists, rely on quick mental math.
Common Mistakes
MISTAKE: Adding the numbers instead of subtracting (e.g., 10 + 8 = 18) | CORRECTION: Remember the minus sign '-' means 'take away' or 'find the difference'.
MISTAKE: Counting forward instead of backward on a number line (e.g., moving 8 steps right from 10) | CORRECTION: Subtraction means decreasing the number, so you always move to the left (backwards) on a number line.
MISTAKE: Miscounting the steps when subtracting (e.g., moving 7 or 9 steps instead of 8) | CORRECTION: Double-check your counting. You can use your fingers or tally marks to be sure.
Practice Questions
Try It Yourself
QUESTION: You have 9 cricket balls, and your friend borrows 4. How many cricket balls are left with you? | ANSWER: 5
QUESTION: A bus has 12 seats. If 7 passengers get off at the first stop, how many passengers are still on the bus? | ANSWER: 5
QUESTION: Priya had 15 rupees. She bought a small packet of biscuits for 6 rupees and a candy for 3 rupees. How much money does she have left? | ANSWER: 6 rupees
MCQ
Quick Quiz
What is the result of taking 8 away from 10?
18
2
8
10
The Correct Answer Is:
B
Taking 8 away from 10 means 10 - 8. If you count back 8 steps from 10, you land on 2. Options A, C, and D are incorrect because they represent addition, the number being subtracted, or the original number.
Real World Connection
In the Real World
When you are checking your mobile data usage, you might see you started with 10 GB and have used 8 GB. To know how much data is remaining, your phone's system performs a calculation just like 10 - 8. This helps you manage your data plan for the month.
Key Vocabulary
Key Terms
SUBTRACTION: Taking one number away from another | DIFFERENCE: The result of a subtraction problem | MINUS SIGN (-): The symbol used for subtraction | NUMBER LINE: A visual tool to represent numbers and perform operations
What's Next
What to Learn Next
Great job understanding basic subtraction! Next, you can explore 'Subtraction with Larger Numbers' or 'Mental Math Techniques for Subtraction'. These will help you solve more complex problems quickly and efficiently.
