Subtracting by adjusting: A math worksheet from urbrainy.com with subtraction exercises and tips for solving 19, 29, 39, etc., using number adjustment strategies.

Problem Overview:

The worksheet focuses on subtracting numbers like 19, 29, 39, etc., using a strategy of adjusting the subtraction by first subtracting a round number (like 20, 30, 40) and then adding 1 back. This method simplifies the subtraction process.

Strategy Explanation:

To subtract a number like 19, 29, or 39:
1. Subtract the next highest multiple of 10 (e.g., 20 for 19, 30 for 29, etc.).
2. Add 1 back to the result because you subtracted 1 more than needed.

For example:
- To calculate \( 44 - 29 \):
- Subtract 30 from 44: \( 44 - 30 = 14 \).
- Add 1 back: \( 14 + 1 = 15 \).
- So, \( 44 - 29 = 15 \).

Solution to Each Problem:

#### 1. \( 44 - 29 \)
- Subtract 30: \( 44 - 30 = 14 \).
- Add 1: \( 14 + 1 = 15 \).
- Answer: \( 15 \)

#### 2. \( 52 - 29 \)
- Subtract 30: \( 52 - 30 = 22 \).
- Add 1: \( 22 + 1 = 23 \).
- Answer: \( 23 \)

#### 3. \( 68 - 39 \)
- Subtract 40: \( 68 - 40 = 28 \).
- Add 1: \( 28 + 1 = 29 \).
- Answer: \( 29 \)

#### 4. \( 65 - 39 \)
- Subtract 40: \( 65 - 40 = 25 \).
- Add 1: \( 25 + 1 = 26 \).
- Answer: \( 26 \)

#### 5. \( 76 - 49 \)
- Subtract 50: \( 76 - 50 = 26 \).
- Add 1: \( 26 + 1 = 27 \).
- Answer: \( 27 \)

#### 6. \( 69 - 49 \)
- Subtract 50: \( 69 - 50 = 19 \).
- Add 1: \( 19 + 1 = 20 \).
- Answer: \( 20 \)

#### 7. \( 82 - 59 \)
- Subtract 60: \( 82 - 60 = 22 \).
- Add 1: \( 22 + 1 = 23 \).
- Answer: \( 23 \)

#### 8. \( 96 - 59 \)
- Subtract 60: \( 96 - 60 = 36 \).
- Add 1: \( 36 + 1 = 37 \).
- Answer: \( 37 \)

#### 9. \( 42 - 29 \)
- Subtract 30: \( 42 - 30 = 12 \).
- Add 1: \( 12 + 1 = 13 \).
- Answer: \( 13 \)

#### 10. \( 51 - 29 \)
- Subtract 30: \( 51 - 30 = 21 \).
- Add 1: \( 21 + 1 = 22 \).
- Answer: \( 22 \)

Final Answers:

\[
\boxed{
\begin{array}{cc}
1. & 15 \\
2. & 23 \\
3. & 29 \\
4. & 26 \\
5. & 27 \\
6. & 20 \\
7. & 23 \\
8. & 37 \\
9. & 13 \\
10. & 22 \\
\end{array}
}
\]