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Abacus Lesson 11 // Addition -Complementary Numbers Respect to 5- HUNDREDS'S Column Video Lecture | Abacus Master Class:Become an Expert (English) - Personal Learning

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FAQs on Abacus Lesson 11 // Addition -Complementary Numbers Respect to 5- HUNDREDS'S Column Video Lecture - Abacus Master Class:Become an Expert (English) - Personal Learning

1. What is an abacus?
Ans. An abacus is a counting tool that consists of a series of rods or wires with beads that can be moved back and forth. It is used for performing arithmetic calculations, particularly addition and subtraction.
2. What is the purpose of using complementary numbers respect to 5 in the hundreds' column?
Ans. The purpose of using complementary numbers respect to 5 in the hundreds' column is to simplify the addition process on an abacus. By using complementary numbers, we can avoid carrying over and make the calculations easier and faster.
3. How do you represent complementary numbers respect to 5 on an abacus?
Ans. To represent complementary numbers respect to 5 on an abacus, you can use the lower part of the abacus beads for numbers less than or equal to 5, and the upper part for numbers greater than 5. For example, for the number 7, you would move one bead from the lower part to the upper part.
4. Can you explain the concept of complementary numbers respect to 5 with an example?
Ans. Sure! Let's say we want to add 8 and 9 on the abacus. Since both numbers are greater than 5, we need to find their complementary numbers respect to 5. The complementary number of 8 is 2 (8 - 5), and the complementary number of 9 is 1 (9 - 5). On the abacus, we would represent 8 as 2 beads in the upper part and 9 as 1 bead in the upper part. Then, we can easily add the complementary numbers and get the result, which is 3.
5. What are the advantages of using an abacus for addition?
Ans. Using an abacus for addition has several advantages. It helps in developing mental calculation skills, improves concentration and focus, enhances hand-eye coordination, and provides a visual and tactile representation of numbers. Moreover, the abacus allows for quick calculations and can be used by people of all ages, including children and adults.
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