# 2.1 Constructing expressions

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.

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Slide 1: Tekstslide
MathSecondary Education

In deze les zitten 8 slides, met interactieve quizzen en tekstslides.

## Onderdelen in deze les

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.

#### Slide 1 -Tekstslide

Label the parts of the expression.
-
Coefficient
terms
variables
constant

#### Slide 2 -Sleepvraag

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)

#### Slide 3 -Sleepvraag

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.

#### Slide 5 -Tekstslide

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

#### Slide 6 -Open vraag

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

#### Slide 7 -Open vraag

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.