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9th grade · Math · Unit 7 of 17

Expressions

Build, compare and match

What your child practices

Writing an expression for a pattern or a sentence, deciding which expressions are equivalent, expanding brackets, and collecting like terms.

Alaska content standards learning standard: A-SSE.1 · building and interpreting expressions in context

How we explain it

Children can open this short lesson before they practice.

  1. An expression uses letters and numbers: 3n + 2.
  2. Equivalent expressions have the same value for every number.
  3. Expand with the distributive property: 2(x + 3) = 2x + 6.

Example: Expand 3(x + 4). 3 × x = 3x. 3 × 4 = 12. Answer: 3x + 12

Expressions in Alaska

In the Alaska content standards, this is unit 7 of 17 in 9th grade Math, after Number Sets and before Lines & Intersections.

Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.

Source: Alaska Department of Education and Early Development

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Figure n in a pattern uses 4n + 1 tiles. How many tiles does figure 17 use?

    answer box

  2. Question 2

    Which expression is NOT equivalent to 4x + 20?

    • 4(x + 5)
    • 4(x + 20)
    • 20 + 4x
    • x + 3x + 20

  3. Question 3

    Which expression is equivalent to 5(x − 5)?

    • 5x − 10
    • 5x − 5
    • 5x − 25
    • x − 25

  4. Question 4

    If n = 10, what is the value of 6n + 1?

    answer box

  5. Question 5

    Ana has 6 fewer than 4 times the number of cards Leo has. If Leo has n cards, which expression gives the number Ana has?

    • 4n − 6
    • 6n − 4
    • 6 − 4n
    • 4(n − 6)

  6. Question 6

    Jay has 5 more than 2 times the number of stickers Sam has. If Sam has n stickers, which expression gives the number Jay has?

    • 7n
    • 2n + 5
    • 5n + 2
    • 2(n + 5)

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