Exploring 7th Grade Math Concepts from the 2018 STAAR Test

The video tutorial covers various mathematical concepts including experimental probability with dice, calculating percentages of pennies dated after 2000, understanding the value of pi using circle formulas, solving equations with models, calculating net worth using assets and liabilities, and multiplying decimals with attention to negative results. Each section provides detailed explanations and examples to enhance understanding.

What is the experimental probability of the number cube showing a five or six?

• 8/20

• 4/10

• 2/5

• 3/10

How many times did the number cube land on six?

• Six times

• Three times

• Eight times

• Five times

What is the experimental probability of the number cube landing on a number other than five or six?

• 3/5

• 2/5

• 1/2

• 3/10

What percentage of Russell's pennies are dated after 2000?

• 60%

• 35%

• 40%

• 25%

What is the total percentage of pennies dated before 2000 and from 1980 to 2000?

• 50%

• 60%

• 40%

• 70%

How many pennies in Russell's collection are dated after 2000?

• 480 pennies

• 720 pennies

• 300 pennies

• 600 pennies

Which formula is used to calculate the value of pi given the circumference and diameter?

• C = 2πr

• C = πd

• A = πr^2

• D = 2r

What is the solution to the equation represented in the model?

• x = 2

• x = 3

• x = 1

• x = 0

What is the current value of Peter's house?

• $101,800

• $90,000

• $23,500

• $19,700

What is the result of multiplying -9 by 2.2?

• -19.8

• 19.8

• -18

• 18