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What is 8 - 7?
Grade Level:
Class 1
Maths, Computing, AI
Definition
What is it?
8 - 7 means taking away 7 from 8. It's a basic subtraction problem where you find the difference between two numbers. The result tells you how much is left after you remove a certain quantity.
Simple Example
Quick Example
Imagine you have 8 ladoos in a box. Your friend eats 7 of them. How many ladoos are left for you? To find out, you calculate 8 - 7.
Worked Example
Step-by-Step
Let's find the answer to 8 - 7:
1. Start with the first number, which is 8.
2. We need to take away 7 from 8.
3. You can count backwards 7 steps from 8: 8, 7, 6, 5, 4, 3, 2, 1.
4. After counting back 7 steps, you land on 1.
5. So, 8 - 7 = 1.
Answer: 1
Why It Matters
Understanding subtraction is fundamental for everything in Maths, from managing your pocket money to solving complex problems. In Computing, even simple programs use subtraction for calculations like reducing item counts or tracking progress. In AI, these basic operations form the building blocks for more advanced algorithms used by data scientists and software engineers.
Common Mistakes
MISTAKE: Confusing subtraction with addition. Forgetting to take away and instead adding the numbers. | CORRECTION: Remember the minus sign (-) means 'take away' or 'reduce'. Always check the operation symbol carefully.
MISTAKE: Counting incorrectly, especially when counting backwards. Forgetting to start from the correct number or skipping a number. | CORRECTION: Start counting backwards from the first number (8 in this case) and clearly count each step until you've taken away the second number (7 steps).
MISTAKE: Thinking that 8 - 7 is the same as 7 - 8. | CORRECTION: Subtraction order matters! Taking 7 from 8 is different from taking 8 from 7. 8 - 7 gives a positive answer, while 7 - 8 would give a negative answer.
Practice Questions
Try It Yourself
QUESTION: You had 9 cricket balls, and 2 went missing. How many are left? | ANSWER: 7
QUESTION: A bus has 10 seats. If 3 passengers get off, how many seats are still occupied? | ANSWER: 7
QUESTION: Priya had 12 stickers. She gave 5 to her brother and then bought 1 more. How many stickers does she have now? | ANSWER: 8
MCQ
Quick Quiz
What is the result of 8 - 7?
0
1
2
7
The Correct Answer Is:
B
When you take 7 away from 8, you are left with 1. Options A, C, and D are incorrect because they do not represent the difference between 8 and 7.
Real World Connection
In the Real World
When you are shopping at the local kirana store and buy an item for ₹7, and you give the shopkeeper ₹8, they need to calculate the change to return to you. They use 8 - 7 to figure out that they owe you ₹1 back.
Key Vocabulary
Key Terms
SUBTRACTION: The process of taking one number away from another to find the difference | DIFFERENCE: The result you get after subtracting one number from another | MINUS SIGN (-): The symbol used to show subtraction | QUANTITY: An amount or number of something
What's Next
What to Learn Next
Great job understanding basic subtraction! Next, you can explore 'Subtraction with Larger Numbers' or 'Subtraction with Regrouping'. These concepts build on what you've learned and will help you solve even bigger subtraction problems with confidence.
