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Children, suppose you have 12 chocolates and your parents have asked you to give 4 chocolates to your friend. How many chocolates do you have left now? Yes, you are right! Now you have 8 chocolates left. But do you know the name of the method you use to find the correct number of chocolates you have left? Today we will do 2-digit addition and subtraction.
The addition of two-digit numbers is known as a binary number. The result is referred to as the sum of the two numbers. The practice of subtracting two or more numbers from each other by two digits is known as two-digit subtraction.
Contents
What is an add-on?
There are four basic arithmetic operations namely addition, subtraction, multiplication and division. Among them, today we will talk about addition. Adding two integers will result in a combination of the two values. Every arithmetic operation has its own unique symbol. In addition, the sign is “+”.
For example:
How many balls does Rishi have if he has 3 green and 2 blue balls?
The total number of balls is $3 + 2 = $5.
$3 + $2 sum of balls
What is a deduction?
To subtract means to take away an item or several items from a group. Every arithmetic operation has its own unique symbol. The sign for subtraction is ‘-‘.
When subtracting two numbers, try to write the larger number first, and the smaller one below. After that, remove each column one by one.
Suppose Kriti has 10 chocolates and she gives up 2 chocolates. Then what is the total number of chocolates that Kriti has?
The total number of chocolates that Kriti has is $10 – 2 = $8.
The difference is $10 – $2 chocolates
How does adding and subtracting 2-digit numbers work?
In addition, more importance is attached to the location of the numbers. Here the place value is expressed as one and ten. To add two-digit numbers, we must first sort them into columns according to their place values. The numbers are added one by one. Here the numbers are called additions and the answer is known as their sum.
There are two methods of regrouping, namely 2-digit addition and subtraction with regrouping. 2-digit addition and subtraction are also possible without regrouping.
When subtracting, the place of the numbers is also more important. After subtraction, the number of items decreases or decreases. Subtraction consists of minuend, subtrahend and difference.
It can be written as $Minuend{rm{ }} – {rm{ }}Subtrahend{rm{ }} = {rm{ }}Difference$.
types of additions
There is a condition in the “regroup” method. Here, the additional number should be transferred to the next column, if the sum of the numbers in any column is greater than 9.
For example: Take the addition of 29 and 52
Since there is a carry value of 1, the result will be 81.
The amount is $29 + $52
The method “without regrouping” is very simple. Here, when the sum is less than or equal to 9, we write the number according to its place value column. Does not transfer any numbers.
For example: Take the addition of 20 and 34
Since there is no carried value, the result will be 54.
Types of subtraction
If the bottom number is greater than the top, take 1 from the tens column and add it to the number in the one’s position. The number in the tens place will decrease by one after adding 1. Now subtract the numbers.
For example: Take the subtraction of 71 and 49
First, subtract 9 from 1. Since we cannot subtract larger numbers from smaller ones, we borrow 1 from the digit in the tens place in the minuend to make one digit larger.
So 1 becomes 11, now we can subtract 9 from 11 and the result is 2 in one column.
After the loan was given, the digit in the tens column was reduced to 6.
Now subtract 4 from 6, we get 2 in the tens column. Thus, the final difference is 22.
The difference between 49 and 71
The method “without regrouping” is very simple. Here always put the larger value at the top and find the difference between the place value column by column. It does not accept rides/loans from any number.
The difference is $24 – $11
2-digit addition and subtraction word problems
Let’s look at some 2-digit addition and subtraction worksheets:
Example 1: Suppose Sima already has 88 pens and her mother gives her 11 more. What is the total number of string pens?
solution:
According to the question, Sima already has = 88 pens and her mother has given = 11 pens more.
The amount is $88 + $11
Now, Sima has a total of $= 88 + 11 = 99$ pens
Therefore, the total number of pins in the string is 99.
Example 2: Suppose Tina already has 99 oranges. He gave up and 55 oranges. Then his father gave him 12 oranges. What is the total number of tin oranges?
solution:
According to the question, Tina already has = 99 oranges, she gave up =55 oranges and her father gave = 12 oranges.
First put the numbers in order with the smallest number followed by the largest, $= 99 – 55 = 44$
then adding the given and obtained numbers,
$start{array}{l} = 44 + 12\ = 56end{array}$
Therefore, Tina has a total of 56 oranges.
Example 3: Out of 66 Rishi flowers, 54 were sold. Now, how many flowers does Rishi have altogether?
solution:
According to the question, Rishi had = 66 flowers and he sold = 54 flowers.
First put the numbers in order with the smallest number followed by the largest,
$begin{array}{l} = 66 – 54 \ = 12end{array}$
Hence, there are 12 Rishi flowers in total.
conclusion
Addition and subtraction are very important in our daily life. It is necessary at every stage of life. For example, when we go out for shopping or office, schools and colleges and during games. We were taught addition and subtraction as children, and we still use them regularly today.
The number of units is increased by addition, and the number of units is decreased by subtraction. Thus, it is clear that the two are completely opposed to each other.
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Source: Math Hello Kitty
Categories: Math
