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6th grade · Math · Unit 7 of 17

Algebra Moves

Monomials and inequalities

What your child practices

Combining like terms such as 3x + 5x, evaluating expressions, and finding values that make an inequality true and showing them on a number line.

Oregon State Standards learning standard: 6.AEE.A.2; 6.AEE.B.7 · evaluating expressions with letters for numbers and writing inequalities of the form x > c or x < c

How we explain it

Children can open this short lesson before they practice.

  1. A variable is a letter that stands for a number.
  2. Add like terms: 3n + 2n = 5n.
  3. To evaluate, replace the letter with its number, then use the order of operations.

Example: Evaluate 2n + 3 when n = 4. Replace n with 4: 2 × 4 + 3. Multiply first: 8. Then add: 8 + 3 = 11. Answer: 11

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

    What is 6n + 2n?

    6n + 2n

    • 12n
    • 8
    • 8n

  2. Question 2

    What is 2y + y?

    2y + y

    • 2y²
    • 3
    • 3y

  3. Question 3

    Evaluate 6n − 2 when n = 6.

    6n − 2, n = 6

    answer box

  4. Question 4

    Which shows the solution to n > 7 on a number line?

    • a closed circle at 7 with an arrow pointing right
    • an open circle at 7 with an arrow pointing right
    • an open circle at 7 with an arrow pointing left

  5. Question 5

    Evaluate 6n + 8 when n = 3.9.

    6n + 8, n = 3.9

    answer box

  6. Question 6

    Which shows the solution to n < 8 on a number line?

    • an open circle at 8 with an arrow pointing left
    • a closed circle at 8 with an arrow pointing left
    • an open circle at 8 with an arrow pointing right

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