Solve: Finding the Difference Between 101,705 and 20,176

Subtraction with Multi-Digit Borrowing

101705  20176776 \begin{aligned} &101705 \\ -& \\ &~~20176 \\ &\underline{\phantom{776}} & \\ \end{aligned}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Each time we consider borrowing 2 digits, and then we'll place
00:07 5 is less than 6
00:11 The tens digit equals 0, so we can't borrow from it
00:15 In this case, we'll borrow one hundred from the hundreds digit for the tens
00:20 Which will change the hundreds from 7 to 6
00:24 And now we'll have 10 instead of 0 in the tens!
00:27 Now we'll borrow ten from the tens for the ones
00:31 Which will change the tens from 10 to 9
00:35 And now we'll have 15 instead of 5 in the ones!
00:39 Subtract ones from ones, and place in ones
00:45 Subtract tens from tens, and place in tens
00:49 Subtract hundreds from hundreds, and place in hundreds
00:53 Subtract thousands from thousands, and place in thousands
00:57 0 is less than 2
01:00 Therefore we'll borrow from the hundred thousands digit for the ten thousands
01:04 Which will change the hundred thousands from 1 to 0
01:07 And now we'll have 10 instead of 0 in the ten thousands!
01:11 Subtract ten thousands from ten thousands, and place
01:15 Place 0 in the missing digits
01:18 Subtract hundred thousands from hundred thousands, and place
01:21 And this is the solution to the problem

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

101705  20176776 \begin{aligned} &101705 \\ -& \\ &~~20176 \\ &\underline{\phantom{776}} & \\ \end{aligned}

2

Step-by-step solution

To solve this problem, we'll execute a vertical subtraction step-by-step:

  • Step 1: Align the numbers:

0 101705020176 \begin{array}{c} \phantom{0\ }101705 \\ - \phantom{0}20176 \\ \hline \end{array}

  • Step 2: Start subtracting from the rightmost digit:

    • Subtract the units position: 565 - 6. We need to borrow because 5 is less than 6:

      • Borrow from the tens place (0 becomes 9 after borrowing), the units digit becomes 15.

      • Now calculate 156=915 - 6 = 9.

    • Next, the tens position: 070 - 7. Again, we need to borrow:

      • Borrow from the hundreds place (7 becomes 6 after borrowing), tens digit becomes 10.

      • Calculate 107=310 - 7 = 3.

    • Next, the hundreds position: 61=56 - 1 = 5.

    • Next, calculate the thousands position: 00=00 - 0 = 0.

    • Finally, subtract the ten-thousands position: 121 - 2. Need to borrow from the hundred-thousands place (1 becomes 0, and ten-thousands become 10):

      • Now, calculate 102=810 - 2 = 8.

  • Step 3: Write down the result from each step:

0  10170502017600 81529 \begin{array}{c} \phantom{0\ \ }101705 \\ - \phantom{0}20176 \\ \hline \phantom{00\ }81529 \\ \end{array}

The subtraction gives us the result: 81529\mathbf{81529}.

Therefore, the solution to the problem is 81529 81529 .

3

Final Answer

81529

Key Points to Remember

Essential concepts to master this topic
  • Rule: Always align numbers by place value before subtracting
  • Technique: When borrowing, convert 0 to 10 and reduce left digit: 101705 becomes 091615
  • Check: Add your answer to the smaller number: 81529 + 20176 = 101705 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to reduce the borrowed-from digit
    Don't just add 10 to the borrowing digit without reducing the left digit = wrong calculation! When you borrow 1 from 7 in the hundreds place, it becomes 6, not stays 7. Always reduce the digit you borrow from by 1.

Practice Quiz

Test your knowledge with interactive questions

\( \begin{aligned} &105 \\ -& \\ &~~~~3 \\ &\underline{\phantom{776}} & \\ \end{aligned} \)

FAQ

Everything you need to know about this question

Why do I need to borrow when the top digit is smaller?

+

You can't subtract a larger digit from a smaller one! Borrowing lets you 'borrow' 10 from the next place value, making the calculation possible. It's like trading a 10billforten10 bill for ten 1 bills.

What happens when I need to borrow from a zero?

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When borrowing from 0, you need to keep going left until you find a digit you can borrow from. The 0 becomes 9 after borrowing, and you continue the chain of borrowing to the right.

How do I check if my subtraction is correct?

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Add your answer to the number you subtracted. If you get the original larger number, you're correct! For example: 81529 + 20176 = 101705

Why does borrowing work?

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Borrowing works because of place value. When you borrow 1 from the tens place, you're actually borrowing 10 ones. It's the same total value, just regrouped!

What if I borrowed wrong and got a different answer?

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Double-check each borrowing step carefully. Make sure you reduced each borrowed-from digit by 1 and added 10 to the borrowing digit. Practice with smaller numbers first!

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