Math Minute 40

Front

What is the formula for the perimeter of a rectangle?

Back

Perimeter = 2(length + width)

Tags

CCSS.3.MD.D.8

Front

If the length of a rectangle is (5x - 3) and the width is (x + 3), how do you find the perimeter when x = 2?

Back

Substitute x = 2 into the expressions: Length = 5(2) - 3 = 7, Width = 2 + 3 = 5. Perimeter = 2(7 + 5) = 24.

Tags

CCSS.6.EE.A.2C

Front

Evaluate the expression -4n - n² for n = 3.

Back

Substitute n = 3: -4(3) - (3)² = -12 - 9 = -21.

Tags

CCSS.6.EE.A.2C

Front

What is the area of a rectangle with dimensions (2c + 1) and (3 + c) when c = 3?

Back

Substitute c = 3: Length = 2(3) + 1 = 7, Width = 3 + 3 = 6. Area = Length × Width = 7 × 6 = 42 square units.

Tags

CCSS.6.EE.A.2C

Front

How do you evaluate an expression with two variables, such as 3x - 4y, when x = 2 and y = 3?

Back

Substitute x = 2 and y = 3: 3(2) - 4(3) = 6 - 12 = -6.

Tags

CCSS.6.EE.A.2C

Front

What is the value of u² if u = 5?

Back

u² = 5² = 25.

Tags

CCSS.6.EE.A.2C

Front

What is the value of 3t - u² when t = 3 and u = 5?

Back

Substitute t = 3 and u = 5: 3(3) - 5² = 9 - 25 = -16.

Tags

CCSS.6.EE.A.2C

Front

What is the definition of a variable in mathematics?

Back

A variable is a symbol used to represent an unknown value or a value that can change.

Tags

CCSS.6.EE.A.2B

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with given numbers.

Tags

CCSS.6.EE.A.2C

Front

What is the formula for the area of a rectangle?

Back

Area = length × width.

Tags

CCSS.3.MD.C.7B

CCSS.4.MD.A.3