What is Doubling a Number?

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Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

Doubling a number means adding the number to itself. It's the same as multiplying the number by 2. When you double a number, you get a value that is twice as big as the original number.

Simple Example

Quick Example

Imagine you have 5 delicious ladoos. If your friend gives you another 5 ladoos, you now have 10 ladoos. You have doubled your ladoos! So, doubling 5 gives you 10.

Worked Example

Step-by-Step

Let's double the number 7.

Step 1: Understand what 'doubling' means. It means adding the number to itself, or multiplying by 2.

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Step 2: Take the number, which is 7.

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Step 3: Add 7 to itself: 7 + 7.

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Step 4: Calculate the sum: 7 + 7 = 14.

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Alternatively, Step 3: Multiply the number by 2: 7 x 2.

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Alternatively, Step 4: Calculate the product: 7 x 2 = 14.

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So, doubling the number 7 gives you 14.

Why It Matters

Understanding doubling is fundamental in math and everyday life. It's crucial for understanding multiplication, percentages, and growth patterns. Careers like finance, retail, and even game development use doubling concepts regularly to calculate profits, discounts, or score multipliers.

Common Mistakes

MISTAKE: Thinking doubling means adding 2. For example, doubling 5 becomes 5 + 2 = 7. | CORRECTION: Doubling means adding the number to itself (5 + 5 = 10) or multiplying by 2 (5 x 2 = 10).

MISTAKE: Getting confused with 'half' or 'triple'. For example, doubling 6 and getting 3 (half) or 18 (triple). | CORRECTION: Doubling is specifically multiplying by 2. Half is dividing by 2, and triple is multiplying by 3.

MISTAKE: Forgetting to apply the operation to all parts of a problem. For example, if you have 2 bags with 3 mangoes each, and you double the mangoes in one bag, but not the other. | CORRECTION: Make sure to apply the doubling operation consistently to the quantity you intend to double.

Practice Questions

Try It Yourself

QUESTION: Your favourite cricketer scored 15 runs. If he doubles his score in the next over, how many runs will he have? | ANSWER: 30 runs (15 + 15 = 30 or 15 x 2 = 30)

QUESTION: A small shop sells chai for Rs. 10 per cup. If the owner decides to double the price, what will be the new price of one cup of chai? | ANSWER: Rs. 20 (10 + 10 = 20 or 10 x 2 = 20)

QUESTION: You have 8 stickers. Your friend has double the number of stickers you have. How many stickers do you both have together? | ANSWER: 24 stickers (Friend has 8 x 2 = 16 stickers. Together: 8 + 16 = 24 stickers)

MCQ

Quick Quiz

What is the result of doubling the number 12?

122

The Correct Answer Is:

Doubling 12 means 12 + 12 or 12 x 2, which both equal 24. Options A, C, and D are incorrect as they don't represent doubling.

Real World Connection

In the Real World

In India, doubling numbers is super useful! Imagine a street vendor who sells 50 samosas in the morning. If he doubles his sales by evening, he knows he sold 100 samosas. Or when planning a budget for a family trip, if the initial transport cost is Rs. 2000 and you need to double it for a return journey, you immediately know it's Rs. 4000.

Key Vocabulary

Key Terms

DOUBLE: To multiply by two or add a number to itself | MULTIPLY: To increase a number by a certain factor | SUM: The result of adding two or more numbers | PRODUCT: The result of multiplying two or more numbers

What's Next

What to Learn Next

Great job understanding doubling! Now you're ready to explore 'halving a number,' which is the opposite of doubling. After that, you can move on to 'tripling a number' and understanding more about multiplication patterns!