What is the Make-10 Strategy?

S1-SA1-0729

Grade Level:

Class 2

Maths, Computing, AI, Mental Maths

Definition

What is it?

The Make-10 Strategy is a mental math technique used to add numbers easily by first creating a group of 10. It helps simplify addition problems, especially when one of the numbers is close to 10 or can be easily combined to make 10.

Simple Example

Quick Example

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

Worked Example

Step-by-Step

Let's add 8 + 6 using the Make-10 Strategy.

Step 1: Identify the number closest to 10. Here, 8 is closer to 10.
---Step 2: Figure out how much you need to add to 8 to make it 10. You need 2 (because 8 + 2 = 10).
---Step 3: Break down the second number (6) into two parts: the part you need to make 10 (which is 2) and the remaining part. So, 6 becomes 2 + 4.
---Step 4: Now, combine the 8 with the 2 to make 10 (8 + 2 = 10).
---Step 5: Add the remaining part (4) to 10. So, 10 + 4 = 14.
---Answer: 8 + 6 = 14.

Why It Matters

This strategy builds strong mental math skills, which are crucial in areas like computing for quick calculations and in AI for processing data efficiently. It's a foundational skill for careers in finance, data analysis, and even game development where quick calculations are needed.

Common Mistakes

MISTAKE: Not breaking down the second number correctly. For example, in 7 + 5, trying to add 3 to 7 to make 10, but then forgetting to subtract 3 from 5. | CORRECTION: Always break the second number into two parts: the amount needed to make 10, and the leftover amount.

MISTAKE: Only applying the strategy when one number is 8 or 9. | CORRECTION: The Make-10 strategy can be used with any numbers where one can 'borrow' from the other to make 10, like 6 + 7 (take 4 from 7 to make 6 into 10).

MISTAKE: Forgetting to add the remaining part after making 10. For example, in 9 + 4, making 9 + 1 = 10 and then stopping. | CORRECTION: Always remember the last step: add the 'leftover' part to the 10 you just made.

Practice Questions

Try It Yourself

QUESTION: Use the Make-10 strategy to solve 9 + 3. | ANSWER: 9 + 1 + 2 = 10 + 2 = 12

QUESTION: A delivery rider has 8 parcels to deliver and picks up 7 more. How many parcels does he have in total using Make-10? | ANSWER: 8 + 7 = 8 + (2 + 5) = (8 + 2) + 5 = 10 + 5 = 15 parcels

QUESTION: If you have 6 points in a game and then score 5 more, what is your total score? Use the Make-10 strategy and show your steps. | ANSWER: 6 + 5 = 6 + (4 + 1) = (6 + 4) + 1 = 10 + 1 = 11 points

MCQ

Quick Quiz

Which step is correct when using the Make-10 strategy for 7 + 6?

7 + 6 = 7 + (3 + 3)

7 + 6 = (7 + 6) + 0

7 + 6 = 10 + 6

7 + 6 = (7 + 4) + 2

The Correct Answer Is:

Option A is correct because to make 7 into 10, you need 3. So, 6 is broken down into 3 and 3. The other options do not correctly apply the Make-10 strategy.

Real World Connection

In the Real World

Imagine a shopkeeper quickly calculating the total cost of a Rs. 8 chai and a Rs. 5 biscuit without a calculator. They might mentally use Make-10: '8 + 2 (from biscuit) makes 10, then 3 more (from biscuit) makes 13'. This quick calculation helps them manage cash faster, just like in digital payments like UPI where speed is key.

Key Vocabulary

Key Terms

MENTAL MATH: Doing calculations in your head without writing them down | STRATEGY: A plan or method used to achieve a goal | DECOMPOSITION: Breaking a number into smaller parts | ADDITION: Combining two or more numbers to find their total

What's Next

What to Learn Next

Once you've mastered making 10, you can explore the 'Make-100' strategy for larger numbers. This builds on the same idea but helps with addition and subtraction involving hundreds, making more complex calculations much simpler!