Examples with solutions for Vertical Subtraction: 3-digit subtraction with the regrouping of hundreds

Exercise #1

amp;768amp;amp;  74amp;776amp; \begin{aligned} &768 \\ -& \\ &~~74 \\ &\underline{\phantom{776}} & \\ \end{aligned}

Video Solution

Step-by-Step Solution

To solve this subtraction problem of 76874768 - 74, we'll use vertical subtraction with borrowing:

Let's lay out the subtraction:

amp;7 6 8amp;0 7 4 \begin{array}{c} &7\ 6\ 8 \\ - & \phantom0\ 7\ 4 \\ \hline \end{array}

Follow these steps:

  • Step 1: Start with the ones column. Subtract 4 from 8. Since 8 is larger, we simply do 84=48 - 4 = 4.

  • Step 2: Move to the tens column. Subtract 7 from 6. Here, 6 is smaller than 7, so we need to borrow from the hundreds column.
        - Cross out the "7" in hundreds place and reduce it by 1 to make it "6".
        - Change 6 in the tens place to 16.
        - Now, perform the subtraction: 167=916 - 7 = 9.

  • Step 3: Move to the hundreds column. Subtract 0 from 7 (after reduction): 70=67 - 0 = 6.

Thus, the result of the subtraction is:

6 9 4 \begin{array}{c} 6\ 9\ 4 \\ \end{array}

Therefore, the answer to the subtraction problem is 694694.

Answer

694

Exercise #2

amp;819amp;amp;  27amp;776amp; \begin{aligned} &819 \\ -& \\ &~~27 \\ &\underline{\phantom{776}} & \\ \end{aligned}

Video Solution

Step-by-Step Solution

To solve the subtraction problem 81927819 - 27, we will check each digit from right to left, performing the necessary operations for subtraction:

  • Units place: Subtract 7 from 9. Since 9 is larger than 7, the result is 2.
  • Tens place: Subtract 2 from 1. Here, 1 is less than 2, so we need to borrow 1 from the hundreds place. This converts the tens place 1 into 11.
  • After borrowing, subtract 2 from 11, resulting in 9.
  • Hundreds place: Since we borrowed from 8, it becomes 7.

Finally, putting these values together gives us the result: 792792.

Therefore, the solution to the problem is 792792.

Answer

792

Exercise #3

amp;956amp;amp;  74amp;776amp; \begin{aligned} &956 \\ -& \\ &~~74 \\ &\underline{\phantom{776}} & \\ \end{aligned}

Video Solution

Step-by-Step Solution

To solve this mathematical problem, we will subtract 74 from 956 using vertical subtraction with regrouping when necessary.

Let's perform the subtraction step-by-step:

  • Step 1: Write the numbers one below the other, aligning them by their place values:

amp;956amp;074amp;776 \begin{aligned} & 956 \\ -& \phantom{0}74 \\ & \underline{\phantom{776}} \end{aligned}

  • Step 2: Start by subtracting the units column: - We have 6 (from 956) minus 4 (from 74), which gives us 2. Place 2 in the units column of the result.

  • Step 3: Move to the tens column: - We have 5 (from 956) minus 7 (from 74). Since 5 is smaller than 7, we need to regroup (borrow) 1 ten from the hundreds column: - This changes the 5 in the tens column to 15 and the 9 in the hundreds column to 8. - Now, subtract 7 from 15, which gives us 8. Place 8 in the tens column of the result.

  • Step 4: Finally, move to the hundreds column: - We have 8 (after regrouping) minus 0 (since there is no hundreds digit in 74), which gives us 8. Place 8 in the hundreds column of the result.

Now, the result is written as:

amp;956amp;074amp;882 \begin{aligned} &956 \\ -&\phantom{0}74 \\ & \overline{882} \end{aligned}

Therefore, the solution to the problem is 882.

Answer

882

Exercise #4

amp;677amp;amp;  85amp;776amp; \begin{aligned} &677 \\ -& \\ &~~85 \\ &\underline{\phantom{776}} & \\ \end{aligned}

Video Solution

Step-by-Step Solution

To solve this subtraction problem, we will follow these steps:

  • Step 1: Set up the subtraction problem, aligning the numbers vertically by their place values:

amp;6amp;7amp;amp;7amp;amp;8amp;amp;5777 \begin{aligned} &\:6\:&7\:&&7 \\ - & \: \:&8\:&&5 \\ \underline{\phantom{777}} \end{aligned}

  • Step 2: Begin subtracting from the units column:

75=27 - 5 = 2. Write 2 in the units place of the answer.

  • Step 3: Move to the tens column:

We have 787 - 8, which requires borrowing.

Borrow 1 from the hundreds column, reducing 6 to 5, and add 10 to the 7 in the tens column, making it 17.

Now, 178=917 - 8 = 9. Write 9 in the tens place of the answer.

  • Step 4: Move to the hundreds column:

Now, 50=55 - 0 = 5. Write 5 in the hundreds place of the answer.

After completing all these steps, the answer to the subtraction problem is 592\textbf{592}.

Therefore, the solution to the problem is 592 592 .

Answer

592

Exercise #5

amp;685amp;amp;  94amp;776amp; \begin{aligned} &685 \\ -& \\ &~~94 \\ &\underline{\phantom{776}} & \\ \end{aligned}

Video Solution

Answer

591