Addition - Orchids The International School
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ORCHIDS The International School

Operations on Numbers

Addition

To find total or count the objects together we use addition.

Example:

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If we have some fruits in two baskets. We put them all together in one big basket. Now to find the total number of fruits, we need to do an Addition.

  • For the sentences ‘all together’, ‘total number’, ‘how many in all’, etc., we need to do addition.
  • Addition is represented by the symbol ‘+’ read as ‘plus’.

Example :

Addition of the numbers 3 and 4 is written as: ‘3+4’.

It is read as ‘3 plus 4’.

Representation:

  • We can add numbers by writing them horizontally as well as vertically in columns.
  • The numbers that are added together are called Addends.
  • When we add two or more numbers, the result is called the Sum. For example;
  • G1_2_ADD_4+5=9.png
  • The symbol ‘=’ is read as ‘is equal to’.
  • ‘4 + 5 = 9’ is read as 4 plus 5 is equal to 9.

Addition of single digit numbers

We can add two numbers in so many ways.

1. By using fingers

G1_3_ADD_FINGERS.png

We can use our hand’s fingers to do the addition. Let’s see.

G1_4_ADD_3+2.png

Nisha has three chocolates. Bipin gives her two more chocolates. Now, we have to find the total number of chocolates Nisha has.

First method:

For three chocolates open three fingers of one hand.

G1_5_ADD_3FINGERS.png

For two chocolates open two more fingers of the other hand.

G1_6_ADD_2FINGERS.png

Now count all the fingers together.

G1_7_ADD_1TO5.png

We get the number 5.

So, Nisha has 5 chocolates in total now.

G1_8_ADD_3+2=5.png

Second method:

For adding 3 and 2, open only two fingers of the hand and count after the number 3.

G1_9_ADD_45.png

It will also give the same answer.

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2. By using counters

Counters: Each counter (object or shape) represent a number.

For example:

6+3= ?
Here we can take any object or shape to represent the numbers. (Counter)

For the number 6 draw six circles.

G1_10_ADD_6CIRCLE.png

For the number 3, draw 3 more circles.

G1_11_ADD_9CICCLE.png

Now, count all the circles together.

G1_12_ADD_NUMBERS IN CIRCLE.png

There are 9 circles in total.

So, we came to know that,

6+3= 9

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3. By using a number line

Number line: A straight line on which numbers are placed at the same distance and in the correct order. Numbers are placed from left to right.

G1_13_ADD_NUMBERLINE1.png

By using number line, we can easily make an addition.

For example:

2+6= ?

First on a number line mark the number 2.

G1_14_ADD_NUMBERLINE2.png

Now move six steps forward to the right side and observe the number where we reach.

G1_15_ADD_NUMBERLINE3.png

We reach at the number 8.

So, 8 is the sum of 2 and 6.

2+6= 8

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4. Do Mentally

By counting mentally, we can do addition.

For example:

4+3= ?

Now, let’s think about the number 4 and count 3 more numbers after 4.

G1_16_ADD_GIRL.png

We get the number 7.

So, the sum of the numbers 4 and 3 is equal to 7.

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Facts

1. When we add 0 to a number, the answer is the number itself.

Example:

    1+0=1

    6+0=6

    0+8=8

    0+9=9

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2. When we add 1 to a number, the answer is the next number.

Example:

1. 2+1=3

Counting the one step forward to 2, we get the number 3.

G1_17_ADD_BOX.png

Finding missing numerals in addition:

Example:

G1_18_ADD_5.png

Here we can take any two numbers whose sum is 5.

0 + 5 = 5

1 + 4 = 5

2 + 3 = 5

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Word problems:

We can solve word problems based on addition by the following steps

Step 1: Identify the numbers in the word problem which need to be added.

Step 2: Write the word problem in the form of addition.

Step 3: Do the addition to find the sum.

Example:

Question: There are 3 red balls and 6 green balls in a box. How many total balls are there in the box?

Answer: Since there are 3 red balls and 6 green balls in the box, we need to add 3 and 6 to find the total number of balls in the box.

G1_19_ADD_GREEN BALL.png

There is total 9 balls in the box.

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