PARCC Grade 8 Math 3

Question 1

What is 4.5 × 10^6 written in standard form?

Accepted Answer

4,500,000

Answer

Moving the decimal six places right gives 4,500,000.

Question 2

Solve the system: y = x + 1 and y = 2x - 3.

Accepted Answer

(4, 5)

Answer

Setting x + 1 = 2x - 3 gives x = 4 and y = 5.

Question 3

A right triangle has legs 6 and 8. What is the hypotenuse?

Accepted Answer

10

Answer

By the Pythagorean theorem, √(36 + 64) = √100 = 10.

Question 4

What is the slope of the line through (2, 3) and (6, 11)?

Accepted Answer

2

Answer

Slope = (11 - 3)/(6 - 2) = 8/4 = 2.

Question 5

Simplify: 3^(-2).

Accepted Answer

1/9

Answer

A negative exponent means the reciprocal: 3^(-2) = 1/3² = 1/9.

PARCC Practice Test