**The problems and examples in the video are arranged from basic to difficult**

**from start to finish..**

**Practice Exercises:**

**1.) | 20 + 30 - 40 |**

**2.) | - 2 / 3 + 1 / 3 |**

**3.) - | (2) (5) - 15 |**

**4.) | - 10 sqrt 5 | + |-5 sqrt 5 |**

**5.) - | 10 - 30 | + | (50 + 30) / 2 |**

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