Can someone please help me and check-over my Spanish homework?

Question

Subject: Numbers

Directions: Fill in the missing cardinal numbers or arithmetic expressions (written out). *My answers are underlined and in bold.*

1. treinta menos dos son veintiocho
2. trescientos plumas (300)
3. ciento cinco votos (105)
4. treinta dividido por seis son cinco
5. dos mil estudiantes (thousand)
6. sesenta y tres millas (63)
7. tres por dos son seis
8. novecientos kilómetros (900)
9. veintiuno alumnos (21)
10. cero dólares (0)

Answer 1

Hi, Jeset! Only two mistakes. Below are the correct answers.

2. trescientas plumas (300)

9. veintiún alumnos (21)

Answer 2

Yes. Remember that even your numbers in the hundreds agree in gender with the noun modified. Also the number 1 always becomes "un" before a masculine noun, thus, veiniún alumnos. Alumnos is masculine.