Addition and Subtraction Questions

Addition And Subtraction Sum

Addition and subtraction are inverse operations of each other. As an illustration, if 9 + 1 = 10, then 10 - 1 = 9. That demonstrates that adding one to 9 shows a result of ten but subtracting one from 10 shows a result of nine.

A number is created by adding two or more additional numbers or values. As an illustration, the outcome of adding 2 and 3 is 5.

2 + 3 = 5

Let's now look at the sum of 2 and 3 practically. What number of apples are there in total if we start with two apples in a basket and then add three more?

2 → 1 + 1

3 → 1 + 1 + 1

2 + 3 = 1 + 1 + 1 + 1 + 1

Counting each apple separately yields a total of 5 apples.

If we now count each apple, there are 5 total.

The ability to add to an existing value results in a rise.

To subtract is to take away another value to obtain the desired value.

For instance, 2 is the result when 3 is subtracted from 5.

5 - 3 = 2

How many apples are left in the basket if we believe there are 5 apples in it, and we take out 3 of them?

So, the answer is 2 apples.

5 - 3 = 1 + 1 + 1 + 1 + 1 - 1 + 1 + 1 = 2

Addition, Subtraction, Multiplication And Division

As we see above, the four major operations in mathematics are:

• Addition

• Subtraction

• Multiplication

• Division

Like addition and subtraction, multiplication and division are also inverse operations of each other.

Let us understand with an example,

If 3 is multiplied by 4,

3 x 4 = 12

So, the answer will be 12.

Now, if 12 is divided by 3,

12 ÷ 3 = 4.

Here, the answer is 4.

Addition And Subtraction For Classes 3 And 4

Grade 4 addition ranges from single two-digit addition with no regrouping. Let's understand more.

Mental Addition

Mental addition is the calculation (addition) of two different or the same values in mind (directly).

Some examples of mental addition are given below,

The sum of 2-digit numbers

13 + 24 = 37

Here, we can easily do a sum of 13 and 24 in mind in the given calculation.

The sum of three different values, two-digit numbers

10 + 12 + 14 = 36

Adding in Columns

For some additions, we need to do the sum of given values by putting them as Columns; let's see,

The sum of 3-digit numbers

123 + 345 =?

So, for the given addition, we have to put this in the column first

123

+ 345

468

Another example

456

+324

780

Here, the sum of the last digits 6 and 4 is 10. So, 0 is written as the answer and 1 will be added at the left-sided digit (5) of 6.

Now, we'll take the example of the addition of 3 three-digit numbers,

789

+ 687

+ 879

????

Here, the sum of the right-sided digit of each value is 9 + 7 + 9 = 25, so 5 will be written down, and 2 will be added at the next digit of 9.

2

789

+ 687

+ 879

5

So, 2 + 8 + 8 + 7 = 25. Now the same as above. 5 will be down, and 2 will be added to the next digit of 8, so at 7.

2

789

+ 687

+ 879

55

So, the sum of 2 + 7 + 6 + 8 = 23

789

+ 687

+ 879

2355

Here’s another example, sum of 456 + 689 =?

First, let’s write the sum in column form,

456

+689

???

Now, the sum of 6 + 9 = 15, 5 will be written down, and 1 is added to 5,

1

456

+689

5

The sum of 1 + 5 + 8 = 14, 4 will be written down, and 1 is added to 4.

1

456

+689

45

Next step, the sum of 1 + 4 + 6 = 11, so 11 will be written down.

456

+689

1145

So, the sum of 456 + 689 = 1145.

Now let's understand subtraction with examples,

Subtraction of 123 from 234

234

- 123

111

We’ll take some more examples to understand subtraction.

159

- 031

128

Let us understand how the subtraction mechanism works.

For example, 159 - 031,

First, we’ll write the given value in subtraction form,

159

- 031

???

Now, to find the answer, we’ll write numbers like this,

1 5 9

- 0 3 1

? ? ?

The first step is to subtract from the value's right side. So, we’ll do a subtraction of 9 and 1. So, 9 - 1 = 8.

1 5 9

- 0 3 1

? ? 8

As the next step, we’ll subtract the left side number of 9. So, for 5 and 3, 5 - 3 = 2.

1 5 9

- 0 3 1

? 2 8

Now, at the last step, the left-sided number of 5. So, 1 - 0 = 1.

1 5 9

- 0 3 1

1 2 8

This is how the subtraction mechanism works. Here we can see that this subtraction is done easily only when removing a small number from a bigger one.