Solve the following subtraction problems involving meters and centimeters: 1. 8 m 62 cm - 5 m 50 cm 2. 7 m 39 cm - 4 m 16 cm 3. 7 m 84 cm - 5 m 67 cm 4. 79 m 49 cm - 59 m 67 cm

$$8 \text{ m} - 5 \text{ m} = 3 \text{ m}$$

The result is $3 \text{ m } 12 \text{ cm}$.
The correct option is (a).

$$\boxed{\text{(a) } 3 \text{ m } 12 \text{ cm}}$$

2. $7 \text{ m } 39 \text{ cm} - 4 \text{ m } 16 \text{ cm}$

$$7 \text{ m} - 4 \text{ m} = 3 \text{ m}$$

The result is $3 \text{ m } 23 \text{ cm}$.
The correct option is (b).

$$\boxed{\text{(b) } 3 \text{ m } 23 \text{ cm}}$$

3. $7 \text{ m } 84 \text{ cm} - 5 \text{ m } 67 \text{ cm}$

$$7 \text{ m} - 5 \text{ m} = 2 \text{ m}$$

The result is $2 \text{ m } 17 \text{ cm}$.
The correct option is (b).

$$\boxed{\text{(b) } 2 \text{ m } 17 \text{ cm}}$$

4. $79 \text{ m } 49 \text{ cm} - 59 \text{ m } 67 \text{ cm}$

$$79 \text{ m} \text{ becomes } 78 \text{ m}$$ $$49 \text{ cm} \text{ becomes } 49 \text{ cm} + 100 \text{ cm} = 149 \text{ cm}$$

$$78 \text{ m} - 59 \text{ m} = 19 \text{ m}$$

The result is $19 \text{ m } 82 \text{ cm}$.
The correct option is (a).

$$\boxed{\text{(a) } 19 \text{ m } 82 \text{ cm}}$$

5. $2 \text{ m } 96 \text{ cm} - 1 \text{ m } 85 \text{ cm}$

$$2 \text{ m} - 1 \text{ m} = 1 \text{ m}$$

The result is $1 \text{ m } 11 \text{ cm}$.
The correct option is (b).

$$\boxed{\text{(b) } 1 \text{ m } 11 \text{ cm}}$$

6. A table $4 \text{ m } 36 \text{ cm}$ long is joined to another $2 \text{ m } 75 \text{ cm}$ long. What is the total length of the new table?

$$4 \text{ m} + 2 \text{ m} + 1 \text{ m} = 7 \text{ m}$$

The total length is $7 \text{ m } 11 \text{ cm}$.
The correct option is (a).

$$\boxed{\text{(a) } 7 \text{ m } 11 \text{ cm}}$$

7. $17 \text{ m } 36 \text{ cm} - 9 \text{ m } 24 \text{ cm}$

$$17 \text{ m} - 9 \text{ m} = 8 \text{ m}$$

The result is $8 \text{ m } 12 \text{ cm}$.
The correct option is (b).

$$\boxed{\text{(b) } 8 \text{ m } 12 \text{ cm}}$$