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What is 8 - 4?
Grade Level:
Class 1
Maths, Computing, AI
Definition
What is it?
8 - 4 means taking away 4 from 8. It is a basic subtraction problem where you find the difference between two numbers. Subtraction helps us know how much is left after some items are removed.
Simple Example
Quick Example
Imagine you have 8 ladoos in a box. Your friend eats 4 of them. To find out how many ladoos are left, you would do 8 - 4. The answer tells you the remaining ladoos.
Worked Example
Step-by-Step
Let's find out what is 8 - 4.
Step 1: Start with the first number, which is 8.
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Step 2: The second number is 4, which means we need to take away 4.
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Step 3: You can count backwards 4 times from 8. So, 8 (first number), then 7 (take away 1), then 6 (take away 2), then 5 (take away 3), then 4 (take away 4).
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Step 4: Alternatively, you can use your fingers. Hold up 8 fingers. Fold down 4 fingers. Count the fingers that are still up.
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Step 5: You will see that 4 fingers are still up.
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So, 8 - 4 = 4.
Why It Matters
Understanding subtraction is fundamental for Maths, Computing, and even AI. In computing, it's used in calculations for game scores or inventory management. Future AI systems use similar logic for comparing quantities, for example, in self-driving cars calculating distances. This skill is vital for engineers, data scientists, and even app developers.
Common Mistakes
MISTAKE: Adding the numbers instead of subtracting (e.g., saying 8 - 4 = 12) | CORRECTION: Remember the minus sign '-' means 'take away', not 'add'.
MISTAKE: Counting backwards incorrectly or missing a number (e.g., 8, 7, 6, 4, missing 5) | CORRECTION: Count slowly and carefully, one number at a time, or use fingers/tally marks to keep track.
MISTAKE: Always subtracting the smaller number from the larger, even if the order is reversed (e.g., thinking 4 - 8 is the same as 8 - 4) | CORRECTION: Subtraction order matters! Always take the second number away from the first number. For Class 1, the first number will always be larger.
Practice Questions
Try It Yourself
QUESTION: You have 7 crayons and give 3 to your friend. How many crayons do you have left? | ANSWER: 4
QUESTION: A bus has 9 passengers. At the next stop, 5 passengers get off. How many passengers are left on the bus? | ANSWER: 4
QUESTION: Your dad buys 10 bananas. You eat 2 in the morning and 3 in the evening. How many bananas are left? | ANSWER: 5
MCQ
Quick Quiz
What is the result of taking 4 away from 8?
12
4
8
0
The Correct Answer Is:
B
Taking 4 away from 8 means 8 - 4. If you count backwards 4 steps from 8 (8, 7, 6, 5, 4), you land on 4. Options A, C, and D are incorrect as they represent addition, the starting number, or taking away all.
Real World Connection
In the Real World
When you pay for something at a shop, like buying a snack for ₹4 with a ₹8 note, the shopkeeper needs to give you back the correct change. They calculate this by doing 8 - 4 = 4. So, you get ₹4 back. This simple subtraction happens every day with UPI payments, grocery shopping, or even checking your mobile data usage.
Key Vocabulary
Key Terms
SUBTRACTION: Taking one number away from another to find the difference | DIFFERENCE: The result you get after subtracting one number from another | MINUS: The symbol '-' which means to subtract or take away | REMAINDER: What is left after something is taken away.
What's Next
What to Learn Next
Great job understanding 8 - 4! Next, you should learn about subtracting larger numbers and then move on to adding numbers. These are the building blocks for all other math concepts, helping you solve even bigger problems.
