Fast Math review grade 7

Front

What is a rational number?

Back

A rational number is any number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero. Examples include 0.75 and -3.

Tags

CCSS.5.NBT.A.2

Front

What is an irrational number?

Back

An irrational number is a number that cannot be expressed as a simple fraction. It is not a terminating or repeating decimal. Examples include √2 and π.

Tags

CCSS.8.NS.A.1

Front

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

Back

To calculate the mean, add all the numbers together and then divide by the total count of the numbers.

Tags

CCSS.6.SP.B.5C

Front

What does it mean for y to be directly proportional to x?

Back

If y is directly proportional to x, it means that as x increases, y increases at a constant rate. This can be expressed as y = kx, where k is a constant.

Front

If 4x = 24, what is the value of x?

Back

x = 6, because you divide both sides by 4.

Tags

CCSS.HSA.REI.A.1

Front

What is the formula for finding the area of a rectangle?

Back

Area = length × width.

Tags

CCSS.4.MD.A.3

CCSS.3.MD.C.7B

Front

What is the difference between a rational and an irrational number?

Back

Rational numbers can be expressed as fractions, while irrational numbers cannot be expressed as fractions.

Front

What is the formula for calculating the perimeter of a rectangle?

Back

Perimeter = 2(length + width).

Tags

CCSS.3.MD.D.8

Front

If the mean of 5 numbers is 20, what is the total sum of those numbers?

Back

The total sum is 100, because mean = total sum / number of items.

Tags

CCSS.6.SP.B.5C

Front

What is the value of y when x = 8 if y is directly proportional to x and y = 10 when x = 5?

Back

y = 16.