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Grade 9 · Math · Unit 2 of 9

Rational Numbers

Fractions and decimals, positive and negative

What your child practises

Adding, subtracting, multiplying and dividing fractions and decimals that may be negative, converting between fractions and decimals, ordering rational numbers, and using BEDMAS.

Nunavut Curriculum approved guide: Alberta Mathematics K–9 (2007), Number · operations on rational numbers and the order of operations

How we explain it

Children can open this short lesson before they practise.

  1. A rational number can be written as a fraction.
  2. To add or subtract, use a common denominator.
  3. A negative times a negative is positive.

Example: −1/2 + 3/4 = ? Common denominator 4: −2/4 + 3/4. −2 + 3 = 1, so 1/4. Answer: 1/4

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

    −2/3 + 2/5 = ?

    • -16/15
    • -1/5
    • -4/15
    • 4/15
    • 0

  2. Question 2

    2/3 ÷ 5/4 = ?

    • 3/5
    • -8/15
    • 8/15
    • 15/8
    • 1/2

  3. Question 3

    Calculate: 8.8 − 4.1 + 4.1 × 2

    answer box

  4. Question 4

    −5.4 + 2.8 = ?

    • 8.2
    • -2.6
    • -8.2
    • 2.6

  5. Question 5

    Write 1/10 as a decimal.

    answer box

  6. Question 6

    What is the value of this expression? Remember BEDMAS.

    8 + (-3) × 4 − 20 ÷ 5 = ?

    answer box

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