PSSA Review Math 8

Front

What is an irrational number?

Back

An irrational number is a number that cannot be expressed as a fraction of two integers. Its decimal representation is non-repeating and non-terminating. Example: √45.

Front

Solve for x: 10x + 9 = 4x - 9

Back

x = -3.

Front

What is a rational number?

Back

A rational number is a number that can be expressed as a fraction of two integers. Its decimal representation is either terminating or repeating. Example: √64.

Front

How do you compare numbers in scientific notation?

Back

To compare numbers in scientific notation, compare the coefficients and the powers of ten. Example: 3.6 x 10^8 is larger than 1.2 x 10^3.

Front

What is the result of rotating a point 90 degrees counterclockwise?

Back

To rotate a point (x, y) 90 degrees counterclockwise, the new coordinates will be (-y, x).

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.

Front

What is the Pythagorean theorem?

Back

In a right triangle, the square of the length of the hypotenuse (c) is equal to the sum of the squares of the lengths of the other two sides (a and b). Formula: a² + b² = c².

Front

What is the difference between a prime number and a composite number?

Back

A prime number has exactly two distinct positive divisors: 1 and itself. A composite number has more than two positive divisors.

Front

What is the slope-intercept form of a linear equation?

Back

The slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept.

Front

What is the formula for the circumference of a circle?

Back

Circumference = 2πr, where r is the radius.