Examples with solutions for Addition and Subtraction of Decimal Fractions: Basic subtraction

Exercise #1

0.20.1= 0.2-0.1=

Video Solution

Step-by-Step Solution

To solve this problem, let's follow these steps:

  • Step 1: Identify the decimal numbers involved, which are 0.20.2 and 0.10.1.
  • Step 2: Align the decimal points for the numbers vertically and perform the subtraction.

Now, let's proceed with the calculation:

0.20.1=0.1 0.2 - 0.1 = 0.1 The operation involves subtracting 0.10.1 from 0.20.2 by aligning the decimal points. Since both numbers have only one decimal place, the decimals align easily, making the subtraction straightforward.

Therefore, the result of the subtraction
0.20.10.2 - 0.1 is 0.10.1.

The correct choice from the given options is Choice 2: 0.10.1.

Answer

0.1

Exercise #2

0.30.2= 0.3-0.2=

Video Solution

Step-by-Step Solution

To solve this subtraction problem effectively, we can follow a clear method of subtracting decimal numbers:

  • Step 1: Align the decimal numbers vertically by their decimal points.
  • Step 2: Write the numbers as:
    0.30.2 \begin{array}{c} \\ 0.3\\ -0.2\\ \hline \end{array}
  • Step 3: Subtract the digits from right to left. Here, we only have the tenths place to consider.
    • Subtract 22 tenths from 33 tenths: 32=13 - 2 = 1.
  • Step 4: The result of the subtraction is 0.10.1.

Thus, the result of the subtraction 0.30.20.3 - 0.2 is 0.10.1.

Answer

0.1

Exercise #3

0.40.2= \text{0}.4-0.2=

Video Solution

Step-by-Step Solution

To solve this problem, let's perform the following steps:

  • Step 1: Write the numbers vertically, aligning the decimal points.
  • Step 2: Subtract as you would with whole numbers, starting from the right.
  • Step 3: Bring down the decimal point in the same position below the numbers being subtracted.

Now, applying these steps to 0.40.20.4 - 0.2:

  • 0.4
  • − 0.2
Subtract the numbers in the tenths place: 42=24 - 2 = 2.

So, the result of 0.40.20.4 - 0.2 is 0.20.2.

In this problem, the correct answer from the provided choices is 0.2.

Answer

0.2

Exercise #4

0.50.3= 0.5-0.3=

Video Solution

Step-by-Step Solution

To solve this problem, we will perform the subtraction of two decimal numbers, 0.5 0.5 and 0.3 0.3 .

  • Align the numbers by their decimal points:

    0.5 0.5

    0.3-0.3

  • Since the numbers are already aligned, subtract the tenths digit of 0.3 0.3 from the tenths digit of 0.5 0.5 :

    53=2 5 - 3 = 2

  • Place this result in the tenths position of the answer, resulting in

    0.2 0.2 .

The subtraction of 0.3 0.3 from 0.5 0.5 results in

0.2 0.2 .

Answer

0.2

Exercise #5

0.6-0.3= \text{0.6-0}.3=

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Identify the given information
  • Step 2: Perform the subtraction of the decimal numbers

Now, let's work through each step:
Step 1: The problem gives us two decimal numbers, 0.60.6 and 0.30.3.

Step 2: Align the decimal points and subtract:

0.60.3=0.30.6 - 0.3 = 0.3

Therefore, the solution to the problem is 0.30.3.

Answer

0.3

Exercise #6

5.72.3= 5.7-2.3= ?

Video Solution

Step-by-Step Solution

Let's solve the problem step by step:

  • Step 1: Align the numbers by their decimal points:
    5.72.3\begin{array}{c} 5.7 \\ - 2.3 \\ \hline \end{array}
  • Step 2: Subtract the digits in the tenths place 73=47 - 3 = 4.
  • Step 3: Subtract the digits in the units place 52=35 - 2 = 3.
  • Step 4: Write down the result by combining both differences, making sure to keep the decimal point aligned: 3.43.4.

Therefore, the solution to the problem is 3.4 3.4 .

Answer

3.4

Exercise #7

6.84.2= 6.8-4.2=

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Align the numbers by their decimal points.
  • Step 2: Subtract the subtrahend from the minuend.
  • Step 3: Place the decimal point in the answer, directly aligned with the decimal points of the numbers.

Now, let's work through each step:
Step 1: Align the numbers, 6.86.8 and 4.24.2, by their decimal points:

6.8 6.8
4.2-4.2
9.9\underline{\phantom{9.9}}

Step 2: Subtract each digit starting from the rightmost end (tenths place). Subtract 22 from 88 to get 66.
Then subtract 44 from 66 to get 22.

6.8 6.8
4.2-4.2
2.6\underline{2.6}

Step 3: Make sure to align the decimal point in the answer with the other decimal points. The result is 2.62.6.

Therefore, the solution to the problem is 2.6 2.6 .

Answer

2.6

Exercise #8

7.95.3= 7.9-5.3=

Video Solution

Step-by-Step Solution

To solve the subtraction problem 7.95.3 7.9 - 5.3 , we will follow a simple step-by-step process:

  • Step 1: Align the decimal points of both numbers. Write 7.9 7.9 directly above 5.3 5.3 such that the decimal points are lined up vertically.

  • Step 2: Perform the subtraction from right to left. Start with the tenths place:
    Subtract 3 3 (from 5.3) from 9 9 (from 7.9) in the tenths place, resulting in 6 6 .

  • Step 3: Move to the units place:
    Subtract 5 5 (from 5.3) from 7 7 (from 7.9) in the units place, resulting in 2 2 .

After subtracting, we find the result of the operation 7.95.3 7.9 - 5.3 is 2.6 2.6 .

Therefore, the solution to the problem is2.6 2.6 .

Answer

2.6

Exercise #9

4.10.1= 4.1-0.1=

Video Solution

Step-by-Step Solution

To solve this problem, we'll perform the subtraction 4.10.1 4.1 - 0.1 .

Here are the steps we will follow:

  • Step 1: Align the decimal points for both numbers.
  • Step 2: Subtract each corresponding digit starting from the rightmost position.
  • Step 3: Ensure the decimal point in the result is directly below the decimal points of the numbers being subtracted.

Now, let's work through each step:

Step 1: Align the numbers:
4.10.1\begin{array}{r} 4.1 \\ - 0.1 \\ \hline \end{array}

Step 2: Perform the subtraction digit by digit:

The tenths column calculation:
11=01 - 1 = 0

The units column calculation:
40=44 - 0 = 4

Step 3: Write down the resulting number with the decimal point correctly placed:
4.04\begin{array}{r} 4.0 \\ \hline 4 \end{array}

Since the trailing zero in 4.04.0 is not necessary, we can write our final answer as 44.

Therefore, the solution to the problem 4.10.1 4.1 - 0.1 is 4 4 .

Answer

4

Exercise #10

15.83.5= 15.8-3.5=

Video Solution

Step-by-Step Solution

To solve the problem 15.83.515.8 - 3.5, we will perform decimal subtraction:

  • Step 1: Align the decimal places.
    Write the numbers so their decimal points are lined up:
    15.83.5 \quad 15.8\\ - \, 3.5\\ --------
  • Step 2: Subtract the numbers column by column.
    - Start from the rightmost digit (tenths place), 85=38 - 5 = 3. Write 33 under the line in the tenths place.
    - Move to the next left column (ones place), 53=25 - 3 = 2. Write 22 in the ones place.
    - The digit in the tens place 11 moves straight down as there is no number to subtract from.
    15.83.512.3 \quad 15.8\\ - \, 3.5\\ \underline{--------}\\ \quad 12.3
  • Step 3: Conclude with the final answer.
    The result of 15.83.515.8 - 3.5 is 12.312.3.

Therefore, the correct answer is: 12.312.3.

Answer

12.3

Exercise #11

0.250.1= 0.25-0.1=

Video Solution

Step-by-Step Solution

To solve the subtraction problem 0.250.10.25 - 0.1, follow these steps:

  • Step 1: Align the numbers vertically, ensuring that the decimal points line up:
  •    0.25
    -  0.10
    -------
    

  • Step 2: Start subtracting from the rightmost column. The tenths position involves subtracting 55 from 00, resulting in 55.
  • Step 3: Move to the next column to the left. Subtract 0.10.1 from 0.20.2, which gives 0.150.15.
  • Step 4: The integer part of both numbers is zero, there is nothing to subtract here.

The result of the subtraction is 0.150.15.

Answer

0.15 0.15

Exercise #12

15.60.3= 15.6-0.3=

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Align the decimal numbers vertically, ensuring that the decimal points are perfectly aligned.
  • Step 2: Subtract the numbers starting from the rightmost digit (the tenths place in this case).
  • Step 3: Write the result directly below, keeping the decimal point aligned in the final answer.

Now, let's work through each step:

Step 1: We have the numbers 15.615.6 and 0.30.3. Align these two numbers:

  15.6
-  0.3
------

Step 2: Start the subtraction from the rightmost digit. Subtract 0.30.3 from 15.615.6. The tenths place: 63=36 - 3 = 3.

In the units place, we then directly bring down the 15, as there is no need to subtract anything further.

  15.6
-  0.3
------
  15.3

Step 3: Ensure the result is aligned with a decimal point directly below the original decimal points: the result is 15.315.3.

Therefore, the solution to the problem is 15.3 15.3 .

Answer

15.3

Exercise #13

0.980.36= 0.98-0.36=

Video Solution

Step-by-Step Solution

To solve the problem of 0.980.36 0.98 - 0.36 , we will perform the following steps, ensuring clarity in how decimal subtraction operates:

  • Step 1: Align the numbers by their decimal points:
       0.98
    -  0.36
         ------

  • Step 2: Subtract from the rightmost column (hundredths place):
    We have 8 minus 6 in the hundredths place, which gives us 2.

  • Step 3: Move to the tenths place:
    In the tenths place, we subtract 3 from 9, which gives us 6.

  • Step 4: Since there is no borrowing across the decimal, move to the units place. Nothing to subtract from left of the decimals, 0 remains unaffected.
        0.98
    -  0.36
        ------
        0.62

Therefore, the final result of the subtraction 0.980.36 0.98 - 0.36 is 0.62 0.62 .

Answer

0.62

Exercise #14

101.23100.1-

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Align the decimal numbers vertically by placing the decimal points in the same column.
  • Subtract each digit from right to left, ensuring to borrow from the next column if necessary.

Let's apply these steps to the problem:

1. Write the numbers in a vertical format:
    101.23
- 100.10
---------

2. Start subtracting from the rightmost column.
- In the hundredths place, subtract 303 - 0, which equals 33.
- Move to the tenths place: subtract 212 - 1, which equals 11.
- Move to the ones place: 101 - 0 equals 11.
- Finally, in the tens place, 000 - 0 equals 00, and in the hundreds place, 111 - 1 equals 00.

3. Combine the digits we calculated by restoring the decimal point placement to get the result:
    1.13

Therefore, the solution to the problem is 1.13 1.13 .

Answer

1.13

Exercise #15

56.222.1= 56.2-22.1=

Video Solution

Step-by-Step Solution

To solve this problem, we will subtract 22.1 22.1 from 56.2 56.2 using the subtraction of decimal fractions method:

Step-by-step solution:

  • Step 1: Align the numbers by the decimal point:    56.222.1 \begin{array}{c} \quad ~~~56.2 \\ - \quad 22.1 \\ \hline \end{array}

  • Step 2: Subtract the digits in each column, starting from the right (tenths place): - First, subtract the tenths: 21=12 - 1 = 1. - Then, subtract the units: 62=46 - 2 = 4. - Finally, subtract the tens: 52=35 - 2 = 3.

This gives us the result of 34.1 34.1 after performing the subtraction.

Thus, the solution to the problem 56.222.1 56.2 - 22.1 is 34.1 34.1 .

Answer

34.1

Exercise #16

47.53.5= 47.5-3.5=

Video Solution

Step-by-Step Solution

To solve the problem of finding 47.53.5 47.5 - 3.5 , we will follow these steps:

  • Step 1: Write the numbers vertically, aligning them by the decimal point.
  • Step 2: Subtract each digit starting from the right (tenths place) and moving left, borrowing where necessary.

Let's perform these steps:

Step 1: Write the numbers aligned by the decimal point:
47.5 47.5
-   3.5 3.5
————

Step 2: Subtract the digits starting from the tenths place:
- Tenths place: 55=05 - 5 = 0
- Units place: 73=47 - 3 = 4
- Tens place: 40=44 - 0 = 4
This results in 44.0 44.0 . Since decimal points don't alter when .0 is at the end, 44.0 44.0 is equal to 44 44 .

Therefore, the solution to the problem is 44 44 .

Answer

44