Solve for the Missing Number: 68 - □ = 9

Inverse Operations with Missing Subtrahends

If

=9 \colorbox{yellow}\\=9

Solve the following subtraction problem:

68= 68- \colorbox{yellow}\\=

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Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

If

=9 \colorbox{yellow}\\=9

Solve the following subtraction problem:

68= 68- \colorbox{yellow}\\=

2

Step-by-step solution

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

  • Step 1: Identify the number represented by the yellow box.
  • Step 2: Perform the subtraction operation.
  • Step 3: Determine the resulting value.

Now, let's work through each step:
Step 1: The problem gives us that the yellow box equals 9.
Step 2: Perform the subtraction operation 689 68 - 9 .
Step 3: Calculating the subtraction, we have 689=59 68 - 9 = 59 .

Therefore, the solution to the problem is 59 59 .

3

Final Answer

59 59

Key Points to Remember

Essential concepts to master this topic
  • Rule: Use addition to find missing subtrahend in subtraction problems
  • Technique: If 68 - □ = 9, then □ = 68 - 9 = 59
  • Check: Substitute back: 68 - 59 = 9 confirms our answer ✓

Common Mistakes

Avoid these frequent errors
  • Subtracting the result from the minuend incorrectly
    Don't think 68 - 9 = 77 by adding instead of subtracting! This confuses the operation and gives the wrong answer. Always remember: to find the missing subtrahend, subtract the result from the minuend.

Practice Quiz

Test your knowledge with interactive questions

If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?

FAQ

Everything you need to know about this question

How do I find what number was subtracted?

+

When you have minuend - □ = difference, find the missing number by calculating minuend - difference. So for 68 - □ = 9, you calculate 68 - 9 = 59.

Why can't I just add 68 + 9?

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Adding would give you 77, but that's not what was subtracted! Think about it: if you subtract 77 from 68, you get a negative number, not 9. The missing number must be smaller than 68.

What's the difference between minuend and subtrahend?

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In subtraction, the minuend is the number you start with (68), the subtrahend is what you take away (the □), and the difference is what's left (9).

How can I check if my answer is correct?

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Substitute your answer back into the original problem! If 68 - 59 = 9, then you know 59 is correct. This verification step helps catch any calculation errors.

What if I get confused about which operation to use?

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Remember: subtraction and addition are inverse operations. If subtraction created the problem, use addition to solve it. Think: 'What plus 9 equals 68?' The answer is your missing number!

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