Find the prime factors for the following numbers: a) 27 b) 40 c) 50 d) 75 e) 90

$$9 = 3 \times 3$$

The prime factors are the numbers at the end of the branches.
The prime factors of 27 are $\boxed{\text{3, 3, 3}}$.

$$10 = 2 \times 5$$

The prime factors are the numbers at the end of the branches.
The prime factors of 40 are $\boxed{\text{2, 2, 2, 5}}$.

$$25 = 5 \times 5$$

The prime factors are the numbers at the end of the branches.
The prime factors of 50 are $\boxed{\text{2, 5, 5}}$.

$$25 = 5 \times 5$$

The prime factors are the numbers at the end of the branches.
The prime factors of 75 are $\boxed{\text{3, 5, 5}}$.

$$15 = 3 \times 5$$

The prime factors are the numbers at the end of the branches.
The prime factors of 90 are $\boxed{\text{2, 3, 3, 5}}$.