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What is Doubling?
Grade Level:
Class 2
Maths, Computing, Biology, Finance, AI
Definition
What is it?
Doubling means multiplying a number by 2. When you double something, you get twice its original amount. It's like having two identical copies of that number.
Simple Example
Quick Example
Imagine you have 5 delicious ladoos. If you double the number of ladoos, you will have 5 + 5 = 10 ladoos. So, doubling 5 gives you 10.
Worked Example
Step-by-Step
Let's double the number 7.
1. Start with the number: 7
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2. To double, we multiply by 2: 7 x 2
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3. Perform the multiplication: 7 x 2 = 14
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4. So, doubling 7 gives you 14.
Answer: 14
Why It Matters
Understanding doubling helps in many fields! In Biology, it explains how cells multiply. In Finance, you might double your savings over time with good investments. Computer scientists use it for efficient calculations. It's a foundational skill for future innovators and problem-solvers.
Common Mistakes
MISTAKE: Adding 2 instead of multiplying by 2. For example, doubling 8 and getting 8 + 2 = 10. | CORRECTION: Remember, doubling means 'twice as much', which is achieved by multiplying the number by 2. So, doubling 8 is 8 x 2 = 16.
MISTAKE: Not knowing multiplication tables for 2. For example, struggling to find 9 x 2. | CORRECTION: Practice your 2-times table! It's one of the easiest tables and is crucial for doubling. You can also add the number to itself (e.g., 9 + 9 = 18).
MISTAKE: Confusing doubling with 'half'. For example, thinking doubling 10 means finding 5. | CORRECTION: Doubling makes a number bigger, while finding 'half' makes it smaller. Doubling 10 means 10 x 2 = 20.
Practice Questions
Try It Yourself
QUESTION: What is double of 6? | ANSWER: 12
QUESTION: A cricket team scored 15 runs in the first over. If they double their score in the next over, how many runs will they have in total after the second over? | ANSWER: 15 x 2 = 30 runs.
QUESTION: Your mom gives you 20 rupees. Your dad says he will double the amount your mom gave you. How much money do you have now? | ANSWER: 20 x 2 = 40 rupees.
MCQ
Quick Quiz
Which operation is used to double a number?
Addition
Subtraction
Multiplication by 2
Division by 2
The Correct Answer Is:
C
Doubling means getting 'twice' the original amount, which is done by multiplying the number by 2. Options A, B, and D perform different operations.
Real World Connection
In the Real World
When you buy groceries online, sometimes offers say 'Double your points on Tuesdays!' This means for every rupee you spend, you get twice the usual reward points. Or think of how quickly a crowd can double at a popular festival if more people keep joining!
Key Vocabulary
Key Terms
DOUBLE: To multiply by 2 | TWICE: Two times the amount | MULTIPLICATION: The process of repeatedly adding a number | SUM: The result of addition
What's Next
What to Learn Next
Great job understanding doubling! Next, you can explore 'Halving', which is the opposite of doubling. After that, you'll be ready for more complex multiplication and division problems!
