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What is 7 - 4?
Grade Level:
Class 1
Maths, Computing, AI
Definition
What is it?
7 - 4 means we start with 7 things and take away 4 of them. It is a simple subtraction problem where we find the difference between two numbers.
Simple Example
Quick Example
Imagine you have 7 delicious laddoos on a plate. If your friend eats 4 of them, how many laddoos are left for you? This is exactly what 7 - 4 helps us figure out.
Worked Example
Step-by-Step
Let's find out what 7 - 4 is:
1. Start with the first number, which is 7. You can think of having 7 objects, like 7 pencils.
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2. The minus sign (-) means we need to take away or remove some objects.
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3. The second number is 4. So, we need to take away 4 pencils from the 7 pencils we started with.
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4. Count back 4 steps from 7: 7, 6, 5, 4, 3.
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5. After taking away 4, you are left with 3 pencils.
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So, 7 - 4 = 3.
Why It Matters
Understanding subtraction is super important for many things! It's the base for solving bigger problems in Maths and even in Computing, where computers calculate differences very fast. Engineers and scientists use subtraction to measure changes and solve complex problems, like figuring out how much fuel a rocket needs.
Common Mistakes
MISTAKE: Counting forward instead of backward. For example, some might count 7, 8, 9, 10 for 7-4. | CORRECTION: Subtraction means 'taking away' or 'counting backward'. Always move to smaller numbers when subtracting.
MISTAKE: Getting confused with addition. Thinking 7 - 4 is the same as 7 + 4. | CORRECTION: The minus sign (-) means subtract, which is different from the plus sign (+) which means add. They are opposite operations.
MISTAKE: Not starting from the correct number. For example, starting from 4 and counting back. | CORRECTION: Always start with the first number given in the subtraction problem and then count backward the number of steps indicated by the second number.
Practice Questions
Try It Yourself
QUESTION: You had 5 cricket balls and lost 2. How many balls do you have now? | ANSWER: 3
QUESTION: There were 9 passengers in an auto-rickshaw. At the next stop, 3 passengers got down. How many passengers are left in the auto? | ANSWER: 6
QUESTION: Your mom bought 10 rotis. Your family ate 6 rotis for dinner, and then your brother ate 1 more. How many rotis are left? | ANSWER: 3
MCQ
Quick Quiz
What is the result of 8 - 5?
13
3
4
5
The Correct Answer Is:
B
When you start with 8 and take away 5, you are left with 3. Options A, C, and D are incorrect as they represent addition or wrong subtraction.
Real World Connection
In the Real World
Every day, you use subtraction! When you pay for a snack with a 10 rupee note and it costs 7 rupees, you subtract to know you'll get 3 rupees back. When watching a cricket match, if a team needs 150 runs to win and has scored 120, you subtract to find out how many more runs they need (150 - 120 = 30 runs).
Key Vocabulary
Key Terms
SUBTRACTION: Taking one number or quantity away from another | MINUS SIGN (-): The symbol used to show subtraction | DIFFERENCE: The result you get when you subtract one number from another | COUNTING BACKWARD: Starting from a number and moving to smaller numbers one by one
What's Next
What to Learn Next
Great job with basic subtraction! Next, you can learn about subtracting larger numbers and then move on to adding numbers. These skills are like building blocks for all of mathematics, making you super smart with numbers!
