### Theory:

Example:
1. $$r+4$$

We can use the addition keywords and form the phrases.

$$r$$ is added to $$4$$.

(or)

$$r$$ is increased by $$4$$.

2. $$25-s$$

We can use the subtraction keywords and form the phrases.

Reduce $$s$$ from $$25$$.

(or)

Difference of $$25$$ and $$s$$.

3. $$64c$$

We can use the multiplication keywords and form the phrases.

The product of $$64$$ and $$c$$.

(or)

$$c$$ times of $$64$$.

4. $$40/4$$

We can use division keywords and form the phrases.

$$4$$ divides $$40$$.

(or)

The ratio of $$40$$ and $$4$$.