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What is 7 - 2?
Grade Level:
Class 1
Maths, Computing, AI
Definition
What is it?
Subtracting means taking away one number from another. When we ask 'What is 7 - 2?', we are finding out how many are left when 2 is taken away from 7. It helps us know the difference between two numbers.
Simple Example
Quick Example
Imagine you have 7 ladoos in a box. If your friend eats 2 of them, how many ladoos are left for you? To find this, you would calculate 7 - 2.
Worked Example
Step-by-Step
Let's solve 'What is 7 - 2?'.
Step 1: Start with the first number, which is 7.
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Step 2: We need to take away the second number, which is 2.
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Step 3: You can count backwards from 7, two times. So, 7, then 6 (first count), then 5 (second count).
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Step 4: Another way is to use your fingers. Hold up 7 fingers. Now, fold down 2 fingers.
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Step 5: Count the fingers that are still up. You will see 5 fingers.
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Answer: So, 7 - 2 = 5.
Why It Matters
Understanding subtraction is super important for everyday life and even in advanced fields. In Maths, it's a basic building block for all calculations. In Computing, even simple programs use subtraction for things like counting down timers or managing inventory. For AI, basic arithmetic helps in processing data. Careers like a Data Analyst, Software Engineer, or even a Shopkeeper use this daily.
Common Mistakes
MISTAKE: Adding the numbers instead of subtracting (e.g., saying 7 - 2 = 9) | CORRECTION: Remember the minus sign '-' means 'take away', not 'add'. Always check the operation symbol.
MISTAKE: Subtracting the first number from the second number (e.g., trying to do 2 - 7 for 7 - 2) | CORRECTION: Always subtract the second number FROM the first number. The order matters in subtraction.
MISTAKE: Counting incorrectly when using fingers or objects (e.g., miscounting the remaining items) | CORRECTION: Double-check your counting. Count slowly and carefully, or use a number line to be sure.
Practice Questions
Try It Yourself
QUESTION: You had 5 cricket balls. You lost 1 ball. How many balls do you have now? | ANSWER: 4
QUESTION: A bus has 10 seats. If 3 people get off, how many people are left on the bus? | ANSWER: 7
QUESTION: Your phone battery was at 9% charge. After making a call, it dropped by 2%. What is the battery percentage now? | ANSWER: 7%
MCQ
Quick Quiz
What is the result of taking away 2 from 7?
9
5
6
2
The Correct Answer Is:
B
Taking away 2 from 7 means 7 - 2. If you count backwards two steps from 7 (7, then 6, then 5), you reach 5. So, 5 is the correct answer.
Real World Connection
In the Real World
When you are shopping at a local kirana store and buy something for Rs. 7, and you give the shopkeeper a Rs. 10 note, the shopkeeper has to calculate how much change to give you back. They do this by subtracting: 10 - 7 = 3. So, they give you Rs. 3 back.
Key Vocabulary
Key Terms
SUBTRACTION: The process of taking one number or quantity away from another | DIFFERENCE: The result of subtracting one number from another | MINUS SIGN (-): The symbol used to show subtraction | TAKE AWAY: To remove a quantity from another quantity
What's Next
What to Learn Next
Great job understanding subtraction! Next, you can learn about 'Subtraction with larger numbers' or 'Subtraction of zero'. These build on what you've learned here and will help you solve even bigger problems easily!
