Adding 1-Digit Number

Understand the concept of adding 1-digit number with the help of objects as well as numbers.

Counting Forward:

We have learnt that counting forward means addition. Here is a frog moving forward on a number line. The frog starts from number 3 and moves 2 steps forward. The frog is now on 5.

Look at the picture below, in a park Aaron is standing near the pole which has number 6 on it. 

He goes forward 3 steps to meet Shelly who is standing near the pole which has number 9 on it.

We learnt how we can add numbers by counting forward. If we want to add 5 to 2, start from 2 and take 5 jumps forward.

This can be written as:

Fill in the blanks:

You have two chocolates. I gave you one. How many will you have? There are 3 chocolates in all. Here the sign = stands for ‘are equal to’. Now two marbles and one marble taken together make three marbles. Thant means if you add 1 to 2, you have 3.

If I give you two chocolates and you have two chocolates, how any will you have? You have now four chocolates. 2 and 2 added together make 4.

Now you have two chocolates and I gave you three. How many will you have? You have 5 chocolates. 2 and 3 added together make 5.

If you have three chocolates and I give you three more, how many will you have? You have now 6 chocolates. 3 and 3 added together make 6.

If Mike has five chocolates and you give him four more, he will have 9 chocolates. Count them. 5 and 4 added together make 9.

In addition we have learnt that when two things and four things are taken together they make six things. The two things and four things are then said to be added together. Thus two and four added together make six.

In arithmetic this is written in a short way as follow:

2 + 4 = 6

The sign or symbol + is called the plus sign and means that the numbers 2 and 4 on either side of it are to be added together.

The sign or symbol = means ‘are’ or ‘is equal to’. Here it tells us that when the numbers 2 and 4 are added together we get 6.

We may read 2 + 4 = 6 as ‘two and four are six’ or we can also say ‘two plus four is equal to six’.

Zero: If you have no chocolates at all, you have zero chocolates.

Zero is written like this 0 and means not any or nothing. If you add 5 to 0, it is still 5. If you add 0 to any number the sum is the same as the number itself.

Regrouping the Numbers:

Regrouping Ones

When the sum of the digits in ones place is more than 9, then we regroup the number in tens and ones.

Lets Regroup the following:

Addition by Regrouping:

Let us add 5 and 8.

Add 5 ones and 8 ones 5 ones + 8 ones = 13 ones 13 ones = 1 ten + 3 ones Write 3 in ones place and carry 1 ten to tens place.

Addition Properties:

Let us study the properties of addition.

Order of Numbers:

Therefore, 4 + 3 = 7 and 3 + 4 = 7

Fill in the blanks:

Therefore, 2 + 6 = 8 and 6 + 2 = 8

When two numbers are added, their sum remains the same,even if the order of the numbers is changed.

Addition with 0:

What do you get when you add 0 to a number?

We see there are 4 beads in a string.
and 0 beads in another string.

Therefore, 4 + 0 = 4

When 0 is added to a number, the sum is the number itself.

Addition with 1:

What do you get when you add 1 to a number?

We see there are 5 stars and 1 star is added to it.

Therefore, 5 + 1 = 6

When 1 is added to a number, the sum is the next number.

Questions and Answers on Adding 1-Digit Number:

1. Add the following by Regrouping:

(i) 9 + 6

(ii) 6 + 5

(iii) 9 + 2

(iv) 9 + 4

(v) 9 + 3

(vi) 7 + 3

(vii) 6 + 9

(viii) 7 + 7

(ix) 7 + 8

Answer:

(i) 15

(ii) 11

(iii) 11

(iv) 13

(v) 12

(vi) 10

(vii) 15

(viii) 14

(ix) 15

2. Add the following.

Answer:

(i) 9

(ii) 10

(iii) 78

3. Fill in the boxes:

(i) Rachel has 4 red chillies      and 5 green chillies. She has ............ chillies in all.

(ii) Aaron has a set of 10 pencils. He gets 3 more pencils. Now, he has ............ pencils together.

Answer:

3. (i)  9 

(ii) 13

4. Fill in the blanks:

(i) 5 + 6 + 7 = ............

(ii) 9 + 42 + 1 = ............

(iii) 72 + 3 + 2 = ............

(iv) 4 + 6 + 1 = ............

(v) 51 + 10 + 3 = ............

(vi) 63 + 2 + 6 = ............

Answer:

4. (i) 18

(ii) 52

(iii) 77

(iv) 11

(v) 64

(vi) 71

5. Fill in the blanks:

(i) 1 + 2 = 2 + 1 = 3

(ii) .......... + 3 = 3 + 2 = ..........

(iii) 4 + 2 = 2 + .......... = ..........

(iv) 6 + 2 = .......... + 6 = ..........

(v) 5 + .......... = 1 + 5 = ..........

(vi) 8 + .......... = 1 + 8 = ..........

(vii) .......... + 8 = 5 + .......... = ..........

(viii) 7 + 3 = .......... + 7 = ..........

Answer:

5. (ii) 2; 5

(iii) 4; 6

(iv) 2; 8

(v) 1; 6

(vi) 1; 9

(vii) 5; 8; 13

(viii) 3; 10

6. Fill in the blanks:

(i) 7 + 0 = 7

(ii) 3 + 0 = ..........

(iii) 2 + .......... = 2

(iv) 9 + .......... = 9

(v) .......... + 0 = 41

(vi) .......... + 0 = 28

Answer:

6. (ii) 3

(iii) 0

(iv) 0

(v) 41

(vi) 28

7. Fill in the blanks:

(i) 5 + 1 = 6

(ii) 7 + 1 = ..........

(iii) 3 + .......... = 4

(iv) 4 + .......... = 5

(v) .......... + 1 = 56

(vi) .......... + 1 = 33

Answer:

7. (ii) 8

(iii) 1

(iv) 1

(v) 55

(vi) 32

8. Fill in the blanks such that the sum is the same.

Answer: 

8. (i) 7; 6; 5; 4

(ii) 4; 3; 2; 1; 0

(iii) 7; 6; 5; 4; 3

(iv) 0; 1; 2; 3; 4

Adding 1-Digit Number

Vertical Addition

Addition Word Problems - 1-Digit Numbers

Subtracting 1-Digit Number

Missing Number in Addition

Missing Number in Subtraction

Subtraction Word Problems – 1-Digit Numbers

Missing Addend Sums with 1-Digit Number

Adding with Zero

Adding Doubles

Addition Fact Sums to 10

Addition Fact Sums to 11

Addition Fact Sums to 12

Addition Fact Sums to 13

Addition Facts of 14, 15, 16, 17 and 18

Subtracting 1-Digit Number

Subtracting 2-Digit Numbers

2nd Grade Math Practice

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