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What is 7 - 5?
Grade Level:
Class 1
Maths, Computing, AI
Definition
What is it?
Subtracting means taking away one number from another. When you calculate '7 - 5', you are finding out how much is left when you take 5 away from 7.
Simple Example
Quick Example
Imagine you have 7 ladoos. If your friend eats 5 of them, how many ladoos are left for you? You subtract 5 from 7 to find the answer.
Worked Example
Step-by-Step
Let's find out what is 7 - 5:
1. Start with the first number, which is 7.
2. We need to take away 5 from it.
3. You can count backwards 5 times from 7: 7 -> 6 (1st time) -> 5 (2nd time) -> 4 (3rd time) -> 3 (4th time) -> 2 (5th time).
4. So, after taking away 5, you are left with 2.
Answer: 7 - 5 = 2
Why It Matters
Understanding basic subtraction is key for all of maths, computing, and even AI! Engineers use it to calculate differences in measurements, and programmers use it in countless calculations. It's the building block for more complex problem-solving.
Common Mistakes
MISTAKE: Subtracting the smaller number from the larger number, even if it's written second (e.g., thinking 5 - 7 is the same as 7 - 5). | CORRECTION: Always subtract the second number from the first number given in the problem.
MISTAKE: Confusing subtraction with addition. (e.g., adding 7 and 5 instead of subtracting). | CORRECTION: Remember that the '-' sign means 'take away' or 'find the difference', not 'put together'.
MISTAKE: Making counting errors when subtracting small numbers. | CORRECTION: Use your fingers, draw lines, or count backwards carefully to ensure accuracy.
Practice Questions
Try It Yourself
QUESTION: You bought 9 pencils and gave 3 to your sister. How many pencils do you have left? | ANSWER: 6 pencils
QUESTION: A bus has 10 seats. If 4 seats are empty, how many passengers are on the bus? | ANSWER: 6 passengers
QUESTION: On Monday, you saved 8 rupees. On Tuesday, you spent 5 rupees. How much money do you have left from your Monday savings? | ANSWER: 3 rupees
MCQ
Quick Quiz
What is the result of 8 - 3?
11
5
6
4
The Correct Answer Is:
B
When you take 3 away from 8, you are left with 5. Options A, C, and D are incorrect because they are either adding or incorrect subtractions.
Real World Connection
In the Real World
Every day, we use subtraction without even thinking! When you check your mobile data balance, you're doing subtraction (Total data - Used data). When a shopkeeper gives you change after you buy something, they are using subtraction. For example, if you pay 100 rupees for something that costs 70 rupees, the shopkeeper subtracts 70 from 100 to give you 30 rupees change.
Key Vocabulary
Key Terms
SUBTRACT: To take away one number from another | DIFFERENCE: The result you get when you subtract one number from another | MINUS SIGN: 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 'Subtraction with larger numbers' or 'Subtraction with borrowing'. These concepts will build on what you've learned here, making you even better at solving maths problems!
