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5's Compliments/Small Friends 2 Digits Addition/Subtraction Video Lecture | Abacus - Class 1

FAQs on 5's Compliments/Small Friends 2 Digits Addition/Subtraction Video Lecture - Abacus - Class 1

1. What are 5's compliments in mathematics?

Ans. 5's compliments are a method used primarily in subtraction, especially in binary and decimal systems. To find the 5's complement of a number, you subtract each digit from 5. For example, the 5's complement of 23 is found by subtracting 2 from 5 (which gives 3) and 3 from 5 (which gives 2), resulting in 32. This technique is useful in simplifying subtraction operations.

2. How do you perform two-digit addition using 5's compliments?

Ans. To perform two-digit addition using 5's compliments, first, find the 5's complement of the second number. Then, add this complement to the first number. If the result is a two-digit number, you may need to adjust it by adding 1 to the result and ignoring any carry. This method helps in simplifying the addition process by converting it into a subtraction problem.

3. Can you explain how to use 5's compliments for two-digit subtraction?

Ans. Yes! To use 5's compliments for two-digit subtraction, you first find the 5's complement of the number being subtracted. Then you add this complement to the original number. If there is no carry after addition, the result will be the answer. If there is a carry, you ignore it and take the result as is. This method allows for easier calculations, especially when dealing with larger numbers.

4. What is the significance of understanding small friends in addition and subtraction?

Ans. Small friends are pairs of numbers that add up to 10, which help in simplifying calculations. For example, knowing that 2 and 8 are small friends allows one to quickly find sums without counting. This concept is particularly useful for young learners as it enhances their mental math skills and helps them recognize patterns in numbers.

5. How can teachers effectively teach 5's compliments and small friends to students?

Ans. Teachers can use visual aids, such as number charts, and interactive games to teach 5's compliments and small friends. Incorporating real-life examples and practice problems can make learning more engaging. Additionally, group activities where students work together to find complements can foster a collaborative learning environment, making the concepts easier to grasp.

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Sep 03, 2025 Last updated

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