Abacus Maths for Class 1: Addition and Subtraction using abacus.

# Counting 1 to 100 Using Abacus for Class 1 Maths

The students will learn to count 2-digit numbers and one-digit numbers using Abacus. Also, they can use the Abacus to add and subtract numbers. Students can also observe colourful number patterns in Abacus; for children, it is effortless to understand place value using Abacus.

## What Is Abacus?

Earlier time ago, people used Abacus for counting numbers. It is like a calculator. We can make addition-subtraction by using an abacus. But do you know, this calculator will work without a battery!!!

There are many types of Abacus, but most schools use a simple abacus. There are 10 strings/rods in a simple abacus. Each rod has 10 beads.

Strings/Rod:

Straight piece of wood or metal.

A bead is a small object with a hole in it.

Tens and Ones by Using Abacus:

We can represent tens and one's place of the number by using Abacus.

### Examples:

We can represent the number 37 by using Abacus as:

From the bottom, the first rod/string represents One's place digit. The second rod/string represents the Tens place digit. First, move all the beads to the left side. We move 7 beads to the right to represent one place number. For tens place number, we move 3 beads to the right side. In this way, we can represent any number by Abacus.

We can make an addition by using Abacus.

### Examples:

Do the addition: 56 + 23 = ?

From the bottom, move 6 beads to the right side in the first rod and 5 beads in the second rod. Then we have to add 23. So, move 3 beads in the first rod and 2 beads in the second rod to the right side. Now count all beads that are on the right side. There are 7 beads in the second rod and 9 beads in the first rod. So, the addition is 79.

Subtraction in Abacus:

We can make subtraction by using Abacus.

### Examples:

Do the Subtraction: 78 – 46 =?

From the bottom, move 8 beads to the right side in the first rod and 7 beads in the second rod. Then we have to subtract 46. So, from the 7 beads move 4 beads to the left side in the second rod. From the 8 beads move 6 beads to the left side of the first rod. Now count all beads that are on the right side. There are 3 beads in the second rod and 2 beads in the first rod. So, the subtraction is 32.
This way, we can easily make addition and subtraction using the Abacus.

## Question 1

Count the Beads of the Abacus. Count and Write the Numbers on Beads Starting From 1 in the Correct Order. And Find How Many Beads Are There in the Abacus.

Count the beads of the Abacus. Count and write the numbers on beads starting from 1 in the correct order. And find how many beads are there in the Abacus.

There is a total of 100 beads in the Abacus. The correct answer is:

## Question 2

Write the Two-Digit Number Represented by the Following Abacus.

Write the two-digit number represented by the following Abacus. Starting from the bottom,

The number of beads in the first rod = One place digit
The number of beads in the second rod = Tens place digit

## Question 3:

Complete the Pattern in the Beads of the Abacus.

Complete the pattern in the beads of the Abacus.

1. In the 1st string = 1 bead, In the 2nd string = 2 beads,
In the 3rd string = 3 beads, In the 4th string = 4 beads.
2. In the 1st string = 1 bead, In the 2nd string = 2 beads,
In the 3rd string = 1 bead, In the 4th string = 2 beads.
3. In the 1st string = 3 beads, In the 2nd string = 2 beads,
In the 3rd string = 1 bead, In the 4th string = 3 beads.
4. In the 1st string = 9 beads, In the 2nd string = 8 beads,
In the 3rd string = 7 beads, In the 4th string = 6 beads.

## Question 4:

Represent the Given Numbers by Drawing the Correct Number of Beads on the Abacus.

## Question 5:

Do the Addition by Using an Abacus.

1. 22 + 36 = ?
2. 54 + 11 = ?
3. 87 – 36 =?

1. First, represent the number 22 on an abacus. Then add the number 36. Count the total number of beads. So we get,
2. 22 + 36 = 58

3. First, represent the number 54 on an abacus. Then add the number 11. Count the total number of beads. So we get,
4. 54 + 11 = 65

5. We have to subtract 36 from 87. Remove 3 beads from 8 and 6 beads from 7 beads. Then count the remaining beads. So we get,
6. 87 – 36 = 51

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