2.2 Constructing expressions

• Mathematics
• Secondary Education

WALT

9Ae.03 Represent a situation either in words or as an algebraic expression, and move between the two representations (including squares, cubes and roots).

Kara thinks of a number, n.  Match the correct expression for the number Kara gets when she:

adds five to the number

multiplies the number by five, then subtracts five

divides the number by five, then adds five

adds five to the number, then multiplies by five

subtracts five from the number, then divides by five

subtracts the number from five

multiplies the number by 7

Write an expression, in terms of x,

subtracts the number from 20

Write an expression, in terms of x,

multiplies the number by 2, then adds 9

Write an expression, in terms of x,

divides the number by 6, then subtracts 4

Write an expression, in terms of x,

multiplies the number by itself

Write an expression, in terms of x,

divides 100 by the number

Write an expression, in terms of x,

subtracts 7 from the number, then multiplies the result by 5

Write an expression, in terms of x,

square roots the number

Write an expression, in terms of x,

cubes the number

Write an expression, in terms of x,

cube roots the number

Write an expression, in terms of x,

multiplies the number by 3, squares the result, then adds 7

Write an expression, in terms of x,

multiplies the number by 2, cubes the result, then subtracts 100

Write an expression, in terms of x,

Copy and answer in your notebook.

Write down an algebraic expression.

I think of a number m,

I divide by 8,

then I cube,

then I subtract 7.

I think of a number x,

I subtract 8 from the number,

then I square,

then I add 2.

I think of a number n,

I square roots the number,

then adds 4.