Find the factors of the following numbers: a. 40 (k) 96 (c) 75 (d) 180 (e) 104

$$1 \times 40 = 40$$ $$2 \times 20 = 40$$ $$4 \times 10 = 40$$ $$5 \times 8 = 40$$

The factors of 40 are $1, 2, 4, 5, 8, 10, 20, 40$.

$$\boxed{1, 2, 4, 5, 8, 10, 20, 40}$$

$$1 \times 96 = 96$$ $$2 \times 48 = 96$$ $$3 \times 32 = 96$$ $$4 \times 24 = 96$$ $$6 \times 16 = 96$$ $$8 \times 12 = 96$$

The factors of 96 are $1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96$.

$$\boxed{1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96}$$

$$1 \times 75 = 75$$ $$3 \times 25 = 75$$ $$5 \times 15 = 75$$

The factors of 75 are $1, 3, 5, 15, 25, 75$.

$$\boxed{1, 3, 5, 15, 25, 75}$$

$$1 \times 180 = 180$$ $$2 \times 90 = 180$$ $$3 \times 60 = 180$$ $$4 \times 45 = 180$$ $$5 \times 36 = 180$$ $$6 \times 30 = 180$$ $$9 \times 20 = 180$$ $$10 \times 18 = 180$$ $$12 \times 15 = 180$$

The factors of 180 are $1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180$.

$$\boxed{1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180}$$

$$1 \times 104 = 104$$ $$2 \times 52 = 104$$ $$4 \times 26 = 104$$ $$8 \times 13 = 104$$

The factors of 104 are $1, 2, 4, 8, 13, 26, 52, 104$.

$$\boxed{1, 2, 4, 8, 13, 26, 52, 104}$$