Subtract 68 from 827: Vertical Format Arithmetic Problem

Column Subtraction with Regrouping Technique

827  68776 \begin{aligned} &827 \\ -& \\ &~~68 \\ &\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 consider a shortage of 2 digits, and then we'll place
00:07 7 is less than 8
00:13 Therefore we subtract 1 from the tens and add this amount to the ones
00:17 In other words, now instead of 7 we'll have 17
00:20 Subtract the ones from the ones plus ten
00:23 Place in ones
00:28 1 is less than 6
00:32 Therefore we subtract 1 from the hundreds and add this amount to the tens
00:37 In other words, now instead of 1 we'll have 11
00:41 Subtract the tens from the tens plus ten
00:44 Place in tens
00:48 Place 0 in the missing digits
00:51 Subtract hundreds from hundreds, and place in hundreds
00:55 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

827  68776 \begin{aligned} &827 \\ -& \\ &~~68 \\ &\underline{\phantom{776}} & \\ \end{aligned}

2

Step-by-step solution

To solve the problem of subtracting 68 from 827, we will perform vertical subtraction with regrouping (borrowing) where necessary.

First, let's write the numbers vertically aligned by place value:

827068776 \begin{aligned} &827 \\ -&\phantom{0}68 \\ &\underline{\phantom{776}} \\ \end{aligned}

Next, we'll perform subtraction starting from the rightmost digit (units place):

  • The units column: 7 (from 827) minus 8. Since 7 is less than 8, we need to borrow 1 from the tens column. After borrowing, the 7 becomes 17.

  • 17 minus 8 equals 9. Write 9 directly under this column.

Now, move to the tens column:

  • Since we borrowed 1, the 2 (from 827) is now 1. Subtract 6 (from 68) from 11 (the borrowed number).
    11 minus 6 equals 5. Write 5 directly under this column.

Finally, the hundreds column:

  • Since no numbers exist below the hundreds place in 68 and we only borrowed from the tens place, we subtract nothing from 8. So, 8 stays the same.

  • Write 8 directly under this column.

Putting it all together, the complete difference is:

827068759 \begin{aligned} &827 \\ -&\phantom{0}68 \\ &\overline{759} \\ \end{aligned}

Therefore, the solution to the problem is 759 759 .

3

Final Answer

759

Key Points to Remember

Essential concepts to master this topic
  • Rule: Align digits by place value when setting up vertical subtraction
  • Technique: Borrow from tens place: 7 becomes 17, then 17 - 8 = 9
  • Check: Add your answer to the subtracted number: 759 + 68 = 827 ✓

Common Mistakes

Avoid these frequent errors
  • Forgetting to reduce the borrowed-from digit
    Don't leave the tens digit as 2 after borrowing = wrong calculation! When you borrow 1 from the 2 in the tens place, it becomes 1, not 2. Always reduce the digit you borrowed 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

When do I need to borrow in subtraction?

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You need to borrow when the top digit is smaller than the bottom digit in any column. Like when you see 7 - 8, you can't subtract a bigger number from a smaller one!

What happens to the digit I borrow from?

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When you borrow 1 from a digit, that digit gets reduced by 1. So if you borrow from 2, it becomes 1. If you borrow from 8, it becomes 7.

How do I remember which direction to borrow?

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Always borrow from the column to the left (the next higher place value). Think of it as borrowing 10 ones from the tens place, or 10 tens from the hundreds place.

What if the digit I want to borrow from is 0?

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If you need to borrow from 0, you'll need to borrow from the next column first. Turn that 0 into 10, then you can borrow 1 from it, leaving 9.

How can I check if my subtraction is correct?

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Use addition to check! Add your answer to the number you subtracted. If you get the original number back, you're right: 759+68=827 759 + 68 = 827

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