Solve Subtraction Pattern: From 70-40=30 to 70-41

Basic Subtraction with Borrowing

If:

7040=30 70-40=30

Solve the following subtraction problem:

7041= 70-41=

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

If:

7040=30 70-40=30

Solve the following subtraction problem:

7041= 70-41=

2

Step-by-step solution

To solve this problem of basic subtraction, follow these steps:

  • Step 1: Identify the numbers involved in the subtraction. In this case, 70 70 is the minuend and 41 41 is the subtrahend.
  • Step 2: Apply the subtraction formula: ab=c a - b = c .
  • Step 3: Perform the subtraction 7041 70 - 41 .

Let's perform the subtraction:
Start by subtracting the units: 0 - 1. Since 0 is less than 1, we need to borrow 1 from the tens place:
This changes 70 to 60 (since we are borrowing 10 to get 10 in the units place), and then subtract 10 - 1 = 9 in the units place.
Now, in the tens place, we subtract 6 - 4 = 2 (since we borrowed 1 from the 7 to make it 6).

Bringing it all together, the result of 7041 70 - 41 is 29 29 .

Therefore, the solution to the problem is 29 29 .

3

Final Answer

29 29

Key Points to Remember

Essential concepts to master this topic
  • Rule: When subtracting larger digit from smaller, borrow from next column
  • Technique: Change 70 to 60 + 10, then calculate 10 - 1 = 9
  • Check: Add answer back: 29 + 41 = 70 ✓

Common Mistakes

Avoid these frequent errors
  • Subtracting smaller from larger when borrowing needed
    Don't calculate 1 - 0 = 1 when you see 0 - 1 = impossible! This ignores place value and gives wrong digits. Always borrow 10 from the next column when the top digit is smaller.

Practice Quiz

Test your knowledge with interactive questions

If we have 85 blocks in total, how many blocks will remain if we remove 4 tens and 1 one?

FAQ

Everything you need to know about this question

Why can't I just do 0 - 1 = 1?

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You can't subtract a larger number from a smaller number in subtraction! When you see 0 - 1, you need to borrow from the tens place first.

What does borrowing actually mean?

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Borrowing means taking 10 from the next column over. So 70 becomes 60 in the tens place and 10 in the ones place, giving you enough to subtract.

How do I remember when to borrow?

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Borrow whenever the top digit is smaller than the bottom digit in any column. If you can't subtract, you need to borrow!

Can I check my subtraction answer?

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Yes! Add your answer to the number you subtracted. If you get the original number back, your subtraction is correct: 29+41=70 29 + 41 = 70

What if I need to borrow from zero?

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When borrowing from 0, you need to keep borrowing left until you find a non-zero digit. Each 0 becomes 9, and the first non-zero digit decreases by 1.

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