Spot & correct the error

Sipho writes: $\tfrac{1}{3}+\tfrac{1}{5}=\tfrac{2}{8}$. Identify the mistake and write the correct sum.

Anika is asked for the AREA of a 10 cm by 3 cm rectangle and writes: Area $=2(10+3)=26$ cm$^{2}$. Identify the mistake and give the correct area.

Thabo writes: $3m^{2}=300$ cm$^{2}$. Identify the mistake and give the correct value.

Sipho is asked for the AREA of a 6 cm by 5 cm rectangle and writes: Area $=2(6+5)=22$ cm$^{2}$. Identify the mistake and give the correct area.

Sipho writes: $4(5x-2)=20x-2$. Identify the mistake and write the correct expansion.

Palesa writes: $-12^{2}=144$. Is Palesa correct? Give the correct value and name the error.

Zinhle is asked for the AREA of a 7 cm by 4 cm rectangle and writes: Area $=2(7+4)=22$ cm$^{2}$. Identify the mistake and give the correct area.

Lerato writes: $(5x)^{2}=5x^{2}$. Identify the mistake and write the correct answer.

Lerato writes: $5m^{2}=500$ cm$^{2}$. Identify the mistake and give the correct value.

Sipho writes: $7m^{2}=700$ cm$^{2}$. Identify the mistake and give the correct value.

Werner writes: $\tfrac{1}{4}+\tfrac{1}{6}=\tfrac{2}{10}$. Identify the mistake and write the correct sum.

Werner writes: $7m^{2}=700$ cm$^{2}$. Identify the mistake and give the correct value.