RAHJ Praxis Math Study Guide 1

Front

What is rounding in mathematics?

Back

Rounding is the process of adjusting the digits of a number to make it simpler and easier to work with, while keeping its value close to what it was. For example, rounding 157 to the nearest ten gives 160.

Front

What is estimation?

Back

Estimation is a method used to find an approximate value that is reasonably close to the actual value. It is often used in calculations to make them easier.

Front

How do you calculate the average of a set of numbers?

Back

To calculate the average, add all the numbers together and then divide by the total count of the numbers. For example, the average of 4, 8, and 12 is (4+8+12)/3 = 8.

Front

What is the mode of a set of data?

Back

The mode is the number that appears most frequently in a data set. For example, in the set {1, 2, 2, 3}, the mode is 2.

Front

How do you find the probability of an event?

Back

Probability is found by dividing the number of favorable outcomes by the total number of possible outcomes. For example, if there are 2 pink socks out of 6 total socks, the probability of pulling a pink sock is 2/6 or 1/3.

Front

What is a variable in mathematics?

Back

A variable is a symbol, often represented by a letter, that stands for a number that can change. For example, in the equation x + 2 = 5, x is the variable.

Front

What does it mean to solve an equation?

Back

To solve an equation means to find the value of the variable that makes the equation true. For example, in the equation x + 3 = 7, solving gives x = 4.

Front

What is a fraction?

Back

A fraction represents a part of a whole and is written as a/b, where 'a' is the numerator (the number of parts) and 'b' is the denominator (the total number of equal parts).

Front

What is a ratio?

Back

A ratio is a comparison of two quantities, showing how many times one value contains or is contained within the other. For example, the ratio of 2 to 3 can be written as 2:3.

Front

What is a linear equation?

Back

A linear equation is an equation that makes a straight line when graphed. It can be written in the form y = mx + b, where m is the slope and b is the y-intercept.