What is Doubling (Numbers)?

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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, or multiplying it by 2. When you double a number, you find out how much two groups of that number would be.

Simple Example

Quick Example

Imagine you have 3 ladoos. If you double the number of ladoos, it means you get another 3 ladoos. So, you would have 3 + 3 = 6 ladoos in total.

Worked Example

Step-by-Step

Let's double the number 7.
---Step 1: Understand what 'doubling' means. It means to add the number to itself, or multiply it by 2.
---Step 2: Take the given number, which is 7.
---Step 3: To double it, we can add 7 to itself: 7 + 7.
---Step 4: Calculate the sum: 7 + 7 = 14.
---Alternatively, we can multiply 7 by 2: 7 x 2 = 14.
---The doubled number is 14.
Answer: 14

Why It Matters

Doubling is a basic skill that helps you understand multiplication and larger numbers. It's useful in careers like finance for calculating interest, in retail for managing stock, and even in sports for tracking scores or distances.

Common Mistakes

MISTAKE: Adding 2 to the number instead of adding the number to itself. For example, doubling 5 and getting 5 + 2 = 7. | CORRECTION: Doubling means adding the number to itself (5 + 5) or multiplying by 2 (5 x 2).

MISTAKE: Thinking 'doubling' means making it half. For example, doubling 10 and getting 5. | CORRECTION: Doubling makes a number bigger, specifically twice as big. Halving makes it smaller.

MISTAKE: Forgetting that doubling applies to any number, even large ones, and trying to guess the answer. | CORRECTION: Always use the rule: add the number to itself, or multiply by 2, no matter how big the number is.

Practice Questions

Try It Yourself

QUESTION: What is double the number of wheels on an auto-rickshaw? | ANSWER: An auto-rickshaw has 3 wheels. Double of 3 is 3 + 3 = 6. So, 6 wheels.

QUESTION: Your favourite cricket team scored 45 runs in the first 5 overs. If they double their score in the next 5 overs, what will their total score be? | ANSWER: Doubling 45 means 45 + 45 = 90 runs. So, their total score would be 45 + 90 = 135 runs.

QUESTION: A small shop sells 12 samosas on Monday. On Tuesday, they sell double the number of samosas they sold on Monday. On Wednesday, they sell double the number of samosas they sold on Tuesday. How many samosas did they sell on Wednesday? | ANSWER: Monday: 12 samosas. Tuesday: Double of 12 is 12 + 12 = 24 samosas. Wednesday: Double of 24 is 24 + 24 = 48 samosas. They sold 48 samosas on Wednesday.

MCQ

Quick Quiz

Which operation correctly shows how to double the number 9?

9 + 2

9 - 2

9 x 2

9 / 2

The Correct Answer Is:

Doubling means multiplying a number by 2. So, 9 x 2 is the correct operation. Options A, B, and D perform addition, subtraction, and division respectively, which are not doubling.

Real World Connection

In the Real World

When you use a food delivery app like Swiggy or Zomato, sometimes there are offers like 'Buy 1 Get 1 Free' or 'Double your order for a small extra cost'. Understanding doubling helps you quickly calculate how much food you'll get or how much it will cost.

Key Vocabulary

Key Terms

DOUBLE: To multiply a number by 2 or add it to itself. | MULTIPLY: To increase a number by a certain factor. | SUM: The result of adding two or more numbers. | TWICE: Two times; double.

What's Next

What to Learn Next

Now that you understand doubling, you can explore 'Halving Numbers'. Halving is the opposite of doubling, and learning it will strengthen your understanding of multiplication and division, helping you solve more complex problems.