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5's Compliments/Small Friends 3 Digits Addition/Subtraction Video Lecture | Abacus - Class 1

FAQs on 5's Compliments/Small Friends 3 Digits Addition/Subtraction Video Lecture - Abacus - Class 1

1. What are 5's complements in three-digit addition and subtraction?

Ans. 5's complement is a method used in arithmetic to simplify the process of subtraction. It involves finding the complement of a number with respect to 5. For three-digit numbers, it means subtracting each digit from 5 to find its complement and then performing addition instead of direct subtraction.

2. How do you perform three-digit addition using 5's complements?

Ans. To perform addition using 5's complements, first find the 5's complement of the number you want to subtract. Then, add this complement to the other number. If there’s an overflow (a carry beyond three digits), you can ignore it to get the final result.

3. Can you provide an example of three-digit subtraction using 5's complements?

Ans. Certainly! For example, to subtract 234 from 456 using 5's complements, first find the 5's complement of 234, which is 5 - 2, 5 - 3, 5 - 4 = 3, 2, 1. Now add this to 456: 456 + 321 = 777. Since there’s no overflow, the result is 777 - 1000 = 777. So, 456 - 234 = 222.

4. What is the significance of using 5's complements in arithmetic?

Ans. The significance of using 5's complements lies in its ability to streamline subtraction operations and reduce errors. It makes calculations easier, especially in programming and digital electronics, where binary arithmetic is used.

5. Are there any specific rules to remember when using 5's complements for addition and subtraction?

Ans. Yes, when using 5's complements, remember to always subtract each digit from 5 to find the complement. Additionally, keep track of carries during addition and be aware of any overflow beyond three digits, which should be ignored for the final result.

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Sep 08, 2025 Last updated

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