What is Making 10 Strategy? | Simple Explanation for Class 2

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What is Making 10 Strategy in Addition?

Grade Level:

Class 2

Maths, Computing, AI

Definition

What is it?

The 'Making 10 Strategy' is a mental math trick used in addition to make calculations easier. It involves breaking down one of the numbers to create a '10' with the other number, and then adding the remaining part.

Simple Example

Quick Example

Imagine you have 7 laddus and your friend gives you 5 more. To find the total, you can 'make a 10'. Take 3 laddus from your friend's 5 to make your 7 into 10. Now you have 10 laddus + 2 remaining laddus (from your friend), which is 12 laddus.

Worked Example

Step-by-Step

Let's add 8 + 6 using the Making 10 Strategy.
---1. Identify the number closer to 10. Here, 8 is closer to 10.
---2. Figure out how much you need to add to 8 to make it 10. You need 2 (because 8 + 2 = 10).
---3. Break down the other number (6) into two parts: the part you need (2) and the remaining part. So, 6 becomes 2 + 4.
---4. Now, add the first number (8) with the part you needed (2) to make 10. So, 8 + 2 = 10.
---5. Finally, add the remaining part (4) to the 10. So, 10 + 4 = 14.
---Answer: 8 + 6 = 14.

Why It Matters

Understanding 'Making 10' helps you do mental math faster, which is super useful in competitive exams or quick calculations. This foundational skill is like building blocks for more complex math in computing and AI, where efficient number handling is key for algorithms and data processing. It can even help you understand how computers quickly process large sets of numbers!

Common Mistakes

MISTAKE: Not breaking down the second number correctly after making 10. | CORRECTION: Always ensure the two parts you break the second number into add up to its original value.

MISTAKE: Trying to make 10 with the wrong number (e.g., trying to make 6 into 10 when 8 is closer). | CORRECTION: Always pick the number that is closer to 10 to make the strategy most efficient.

MISTAKE: Forgetting to add the 'leftover' part after making 10. | CORRECTION: Remember the strategy has two steps: first make 10, then add the remaining part.

Practice Questions

Try It Yourself

QUESTION: Add 9 + 4 using the Making 10 Strategy. | ANSWER: 13

QUESTION: A chaiwala sold 7 cups of chai in the morning and 8 cups in the afternoon. How many cups did he sell in total using the Making 10 Strategy? | ANSWER: 15 cups

QUESTION: Your mobile data pack gives you 6 GB. You bought an add-on of 7 GB. How much total data do you have now using the Making 10 Strategy? | ANSWER: 13 GB

MCQ

Quick Quiz

Which of these shows the correct first step to solve 7 + 5 using the Making 10 Strategy?

7 + (2 + 3)

(7 + 5) + 0

5 + (5 + 2)

7 + (3 + 2)

The Correct Answer Is:

Option D is correct because 7 needs 3 to become 10. So, we break 5 into 3 and 2. Options A and C break down numbers incorrectly for this strategy, and Option B doesn't use the strategy.

Real World Connection

In the Real World

When you're quickly calculating how much change you'll get back at a kirana store after buying something for Rs 7 and giving Rs 15, your brain might naturally use a 'making 10' idea. Or when a cricket commentator quickly adds runs in their head during a match, they often use similar mental math shortcuts to keep up with the score.

Key Vocabulary

Key Terms

STRATEGY: A plan or method used to achieve a goal. | MENTAL MATH: Doing calculations in your head without writing them down. | BREAK DOWN: To separate a number into smaller parts. | ADDITION: The process of combining numbers to find their total.

What's Next

What to Learn Next

Once you're good at Making 10, you can explore the 'Making 100' or 'Making 1000' strategies for larger numbers. These build directly on the same idea and will make you even faster at mental calculations!