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What is 8 - 5?
Grade Level:
Class 1
Maths, Computing, AI
Definition
What is it?
8 - 5 means we start with 8 items and take away 5 items from them. It is a basic subtraction problem, which is finding the difference between two numbers.
Simple Example
Quick Example
Imagine you have 8 ladoos. If you eat 5 of them, how many ladoos are left? You are performing 8 - 5 to find out.
Worked Example
Step-by-Step
Let's find the answer to 8 - 5 using counting.
Step 1: Start with the first number, which is 8.
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Step 2: Now, we need to take away, or subtract, 5 from 8. You can count backwards 5 times from 8.
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Step 3: Count back one: 8 - 1 = 7.
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Step 4: Count back two: 7 - 1 = 6.
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Step 5: Count back three: 6 - 1 = 5.
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Step 6: Count back four: 5 - 1 = 4.
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Step 7: Count back five: 4 - 1 = 3.
So, 8 - 5 = 3.
Why It Matters
Understanding basic subtraction like 8 - 5 is crucial for higher Maths, Computing, and even AI. It's used in programming to manage resources, in data science to find differences in data sets, and in AI algorithms for calculations. Future engineers and data scientists use these fundamental skills daily.
Common Mistakes
MISTAKE: Adding the numbers instead of subtracting (e.g., saying 8 + 5 = 13) | CORRECTION: Remember the minus sign (-) means 'take away' or 'find the difference'.
MISTAKE: Counting up from 5 to 8 and saying the answer is 8 (e.g., 5, 6, 7, 8) | CORRECTION: When subtracting, you are finding how many steps there are from the smaller number to the larger, or counting down from the larger number.
MISTAKE: Subtracting the smaller number from the larger number incorrectly (e.g., 8 - 5 = 2 by mistake) | CORRECTION: Double-check your counting or use your fingers/objects to verify the answer.
Practice Questions
Try It Yourself
QUESTION: What is 7 - 3? | ANSWER: 4
QUESTION: If you have 9 cricket balls and 4 go missing, how many are left? | ANSWER: 5
QUESTION: A shop had 10 packets of biscuits. They sold 6 packets in the morning and 2 more in the afternoon. How many packets are left? | ANSWER: 2
MCQ
Quick Quiz
What is the result of 8 - 5?
2
3
4
13
The Correct Answer Is:
B
When you take 5 away from 8, you are left with 3. Options A, C, and D are incorrect results of this subtraction.
Real World Connection
In the Real World
Subtraction is everywhere! When your mobile phone shows you had 8 GB of data and you used 5 GB, it's telling you 8 - 5 = 3 GB are left. Or when you pay with a 100 rupee note for something that costs 70 rupees, the shopkeeper subtracts to give you 30 rupees back.
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 | COUNTING BACK: A method to subtract by counting downwards from a number
What's Next
What to Learn Next
Great job understanding 8 - 5! Next, you can explore subtracting larger numbers or subtracting numbers with borrowing. These build on the basic idea of taking away and will help you solve even more complex problems.
