2.1 Constructing expressions

• Math
• Secondary Education

2.1 Constructing expressions

WALT: 

use letters to represent numbers

use the correct order of operations in algebraic expressions

use words or letters to represent a situation.

Label the parts of the expression.

-

Coefficient

terms

variables

constant

Match each description with the correct expression.

1) Multiply n by 5 and subtract 4

2) Add 4 and n, then multiply by 5

3) Multiply n by 5 and add 4

4) Add 5 and n, then multiply by 4

5) Subtract 4 from n, then multiply by 5

6) Subtract 5 from n, then multiply by 4

1

2

3

4

5

6

5(n + 4)

4(n + 5)

4(n − 5)

5n − 4

5n + 4

5(4 − n)

5(n − 4)

The price of one bag of cement is $c.
The price of one bag of gravel is $g.
The price of one bag of sand is $s.

Write an expression for the total cost of

a. one bag of cement and three bags of sand

b. three bags of cement, four bags of gravel and six bags of sand.

Write an expression for
the perimeter and area
of this rectangle.

Write an expression for
the perimeter and area
of this rectangle.

The shortest side of a triangle is y cm.
The second side is 3 cm longer than the shortest side.
The third side is twice as long as the second side.
Write an expression, in its simplest form, for the perimeter of the triangle.