1st Grade Subtraction Worksheets - free & printable | Worsheets library - Free Printable

Problem Description:

The task involves solving a series of subtraction problems where one of the numbers is missing. The problems are designed for Grade 1 students and involve subtracting a 1-digit number from a 2-digit number, with no borrowing required. The goal is to find the missing number in each equation.

Solution Approach:

1. Understand the Structure: Each problem is a subtraction equation where one of the numbers is missing. The equations are structured as:
- \( \text{Number} - \text{Missing Number} = \text{Result} \)
- \( \text{Missing Number} - \text{Number} = \text{Result} \)
- \( \text{Number} - \text{Number} = \text{Missing Number} \)

2. Solve Each Equation:
- If the missing number is the minuend (the number being subtracted from), rearrange the equation to solve for it.
- If the missing number is the subtrahend (the number being subtracted), rearrange the equation to solve for it.
- If the missing number is the result, directly compute it using subtraction.

3. No Borrowing: Since the problems specify "no borrowing," all subtractions can be performed straightforwardly without needing to borrow from the next place value.

Step-by-Step Solutions:

#### Problems 1–10:
1. \( 94 - 1 = \_\_\_ \)
- \( 94 - 1 = 93 \)
- Answer: \( 93 \)

2. \( 20 - \_\_\_ = 20 \)
- The only number that can be subtracted from 20 to get 20 is 0.
- Answer: \( 0 \)

3. \( 9 - 4 = \_\_\_ \)
- \( 9 - 4 = 5 \)
- Answer: \( 5 \)

4. \( 90 - 0 = \_\_\_ \)
- Subtracting 0 from any number leaves the number unchanged.
- Answer: \( 90 \)

5. \( 32 - \_\_\_ = 32 \)
- The only number that can be subtracted from 32 to get 32 is 0.
- Answer: \( 0 \)

6. \( 51 - 0 = \_\_\_ \)
- Subtracting 0 from any number leaves the number unchanged.
- Answer: \( 51 \)

7. \( \_\_\_ - 8 = 10 \)
- Let the missing number be \( x \). Then \( x - 8 = 10 \).
- Solve for \( x \): \( x = 10 + 8 = 18 \).
- Answer: \( 18 \)

8. \( 52 - 1 = \_\_\_ \)
- \( 52 - 1 = 51 \)
- Answer: \( 51 \)

9. \( 10 - \_\_\_ = 10 \)
- The only number that can be subtracted from 10 to get 10 is 0.
- Answer: \( 0 \)

10. \( \_\_\_ - 8 = 20 \)
- Let the missing number be \( x \). Then \( x - 8 = 20 \).
- Solve for \( x \): \( x = 20 + 8 = 28 \).
- Answer: \( 28 \)

#### Problems 11–20:
11. \( 8 - 2 = \_\_\_ \)
- \( 8 - 2 = 6 \)
- Answer: \( 6 \)

12. \( \_\_\_ - 4 = 3 \)
- Let the missing number be \( x \). Then \( x - 4 = 3 \).
- Solve for \( x \): \( x = 3 + 4 = 7 \).
- Answer: \( 7 \)

13. \( \_\_\_ - 10 = 53 \)
- Let the missing number be \( x \). Then \( x - 10 = 53 \).
- Solve for \( x \): \( x = 53 + 10 = 63 \).
- Answer: \( 63 \)

14. \( \_\_\_ - 3 = 35 \)
- Let the missing number be \( x \). Then \( x - 3 = 35 \).
- Solve for \( x \): \( x = 35 + 3 = 38 \).
- Answer: \( 38 \)

15. \( 96 - 4 = \_\_\_ \)
- \( 96 - 4 = 92 \)
- Answer: \( 92 \)

16. \( 95 - \_\_\_ = 94 \)
- Let the missing number be \( x \). Then \( 95 - x = 94 \).
- Solve for \( x \): \( x = 95 - 94 = 1 \).
- Answer: \( 1 \)

17. \( \_\_\_ - 4 = 35 \)
- Let the missing number be \( x \). Then \( x - 4 = 35 \).
- Solve for \( x \): \( x = 35 + 4 = 39 \).
- Answer: \( 39 \)

18. \( \_\_\_ - 1 = 24 \)
- Let the missing number be \( x \). Then \( x - 1 = 24 \).
- Solve for \( x \): \( x = 24 + 1 = 25 \).
- Answer: \( 25 \)

19. \( 60 - 0 = \_\_\_ \)
- Subtracting 0 from any number leaves the number unchanged.
- Answer: \( 60 \)

20. \( 85 - 2 = \_\_\_ \)
- \( 85 - 2 = 83 \)
- Answer: \( 83 \)

Final Answers:

\[
\boxed{
\begin{array}{ll}
1. & 93 \\
2. & 0 \\
3. & 5 \\
4. & 90 \\
5. & 0 \\
6. & 51 \\
7. & 18 \\
8. & 51 \\
9. & 0 \\
10. & 28 \\
11. & 6 \\
12. & 7 \\
13. & 63 \\
14. & 38 \\
15. & 92 \\
16. & 1 \\
17. & 39 \\
18. & 25 \\
19. & 60 \\
20. & 83 \\
\end{array}
}
\]