Grade 8 | Unit 8 | Lesson 3: Rational and Irrational Numbers | Practice Problems

Decide whether each number in this list is rational or irrational.

• 0.1234

• -77

• 7

• 3.74

• The square’s side length is 5.

• The square’s side length is between 5 and 6.

• The square’s side length is between 6 and 7.

• The square’s side length is 7.

The graph represents the area of arctic sea ice in square kilometers as a function of the day of the year in 2016. Give an approximate interval of days when the area of arctic sea ice was decreasing.

The graph represents the area of arctic sea ice in square kilometers as a function of the day of the year in 2016. On which days was the area of arctic sea ice 12 million square kilometers?

The high school is hosting an event for seniors but will also allow some juniors to attend. The principal approved the event for 200 students and decided the number of juniors should be 25% of the number of seniors. How many juniors will be allowed to attend?