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Grade 4 · Math · Unit 9 of 16

Solve It

Equations, variables and inequalities

What your child practises

Using a letter or symbol for an unknown number, solving equations, checking an answer, and finding numbers that make an inequality true.

Ontario Curriculum expectation: C2.1–C2.3 · symbols as variables, solving equations to 50, and inequalities to 20

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

    Solve for n.

    n ÷ 5 = 8

    answer box

    Show answer

    40

    Hint: Think about which operation undoes the one you see.

  2. Question 2

    Which number makes n + 13 < 19 true?

    n + 13 < 19

    • 7
    • 10
    • 5
    Show answer

    5

    Hint: Put each choice in for n and check whether the left side is less than the right.

  3. Question 3

    Is n = 24 the solution to n + 4 = 27?

    24 + 4 = 27

    • No
    • Yes
    Show answer

    No

    Hint: Put 24 in for n and see whether both sides are equal.

  4. Question 4

    Mia had some stickers. She got 9 more, and now has 38. How many did she start with?

    n + 9 = 38

    • 28
    • 32
    • 29
    Show answer

    29

    Hint: Write it as n + 9 = 38, then solve for n.

  5. Question 5

    In 3 × n = 24, what does n stand for?

    3 × n = 24

    • a number we do not know yet
    • the number 3
    • the answer 24
    Show answer

    a number we do not know yet

    Hint: A variable is a symbol, like n or ☐, that stands for an unknown number.

  6. Question 6

    Which number makes n + 5 > 12 true?

    n + 5 > 12

    • 7
    • 3
    • 10
    Show answer

    10

    Hint: Put each choice in for n and check whether the left side is greater than the right.

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