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What is 9 - 7?
Grade Level:
Class 1
Maths, Computing, AI
Definition
What is it?
Subtracting means taking one number away from another. When we ask 'What is 9 - 7?', we want to find out how much is left if we start with 9 and remove 7.
Simple Example
Quick Example
Imagine you have 9 ladoos. If your friend eats 7 of them, how many ladoos are left for you? You started with 9, 7 were taken away, so you need to find the difference.
Worked Example
Step-by-Step
Let's find out what is 9 - 7.
1. Start with the first number, which is 9. Imagine you have 9 fingers up.
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2. Now, we need to subtract the second number, which is 7. This means we need to take away 7.
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3. From your 9 fingers, put down 7 fingers one by one.
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4. Count how many fingers are still up. You will see 2 fingers remaining.
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So, 9 - 7 = 2.
Why It Matters
Understanding basic subtraction like 9 - 7 is crucial for all of Maths, Computing, and even AI. It's the foundation for calculations in programming, data analysis, and even designing smart systems. Engineers, data scientists, and app developers use these simple ideas daily to build complex solutions.
Common Mistakes
MISTAKE: Adding the numbers instead of subtracting (e.g., 9 + 7 = 16) | CORRECTION: Remember the minus sign '-' means to take away, not to add.
MISTAKE: Subtracting the first number from the second (e.g., 7 - 9) | CORRECTION: Always subtract the second number from the first number given in the problem.
MISTAKE: Counting incorrectly when taking away (e.g., taking away 6 instead of 7) | CORRECTION: Double-check your counting when you are removing items or counting backwards.
Practice Questions
Try It Yourself
QUESTION: What is 8 - 5? | ANSWER: 3
QUESTION: A bus had 10 passengers. At the next stop, 6 passengers got down. How many passengers are left on the bus? | ANSWER: 4
QUESTION: You have 12 pens. If you give 3 pens to your brother and 5 pens to your sister, how many pens do you have left? | ANSWER: 4
MCQ
Quick Quiz
What is the result of 9 minus 7?
16
2
1
9
The Correct Answer Is:
B
9 minus 7 means taking 7 away from 9. If you count backwards 7 steps from 9 (9, 8, 7, 6, 5, 4, 3, 2), you land on 2. So, 9 - 7 = 2.
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 7 GB. To know how much is left, your phone's system does a quick subtraction: 10 - 7 = 3 GB. This simple math helps you manage your data plan!
Key Vocabulary
Key Terms
SUBTRACT: To take one number away from another to find the difference. | DIFFERENCE: The result you get when you subtract one number from another. | MINUS: The symbol '-' which means to subtract. | REMAINDER: What is left after subtraction.
What's Next
What to Learn Next
Great job understanding basic subtraction! Next, you can learn about subtracting larger numbers, subtraction with borrowing, and how subtraction relates to addition. These skills will help you solve even bigger math problems in daily life.
