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Number

Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.

Operations with Rational Numbers (Integers, Fractions, Decimals)

Subtopic

Operations with Rational Numbers (Integers, Fractions, Decimals) under Number for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Find the total: 110+210+310\frac{1}{10} + \frac{2}{10} + \frac{3}{10}.

    A.

    630\frac{6}{30}

    B.

    35\frac{3}{5}

    C.

    310\frac{3}{10}

    D.

    12\frac{1}{2}

  2. 2.

    Divide −100÷10-100 \div 10.

    A.

    1010

    B.

    −110-110

    C.

    −90-90

    D.

    −10-10

  3. 3.

    Calculate 25−0.525 - 0.5.

    A.

    24.524.5

    B.

    25.525.5

    C.

    2020

    D.

    24.9524.95

Download the worksheet for Number - Operations with Rational Numbers (Integers, Fractions, Decimals) to practice offline. It includes additional chapter-level practice questions.

Exponents and Powers

Subtopic

Exponents and Powers under Number for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Simplify z3⋅z0z^3 \cdot z^0.

    A.

    z0z^0

    B.

    z3z^3

    C.

    0

    D.

    1

  2. 2.

    Write 8.2×1018.2 \times 10^1 in standard form.

    A.

    0.82

    B.

    8.2

    C.

    82

    D.

    820

  3. 3.

    Evaluate (−1)22(-1)^{22}.

    A.

    −1-1

    B.

    1

    C.

    −22-22

    D.

    22

Download the worksheet for Number - Exponents and Powers to practice offline. It includes additional chapter-level practice questions.

Square Roots and Cube Roots

Subtopic

Square Roots and Cube Roots under Number for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    What is the square root of 256?

    A.

    14

    B.

    16

    C.

    18

    D.

    26

  2. 2.

    Find the value of xx if x3=4\sqrt[3]{x} = 4.

    A.

    16

    B.

    12

    C.

    64

    D.

    2

  3. 3.

    Between which two consecutive integers is 70\sqrt{70}?

    A.

    7 and 8

    B.

    8 and 9

    C.

    9 and 10

    D.

    35 and 36

Download the worksheet for Number - Square Roots and Cube Roots to practice offline. It includes additional chapter-level practice questions.

Scientific Notation

Subtopic

Scientific Notation under Number for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    Convert 0.01010.0101 to scientific notation.

    A.

    1.01×10−11.01 \times 10^{-1}

    B.

    1.01×10−21.01 \times 10^{-2}

    C.

    10.1×10−310.1 \times 10^{-3}

    D.

    1.01×1021.01 \times 10^2

  2. 2.

    Express 8.8×1028.8 \times 10^2 in standard form.

    A.

    8888

    B.

    8,8008,800

    C.

    880880

    D.

    0.0880.088

  3. 3.

    What is 0.0000004050.000000405 in scientific notation?

    A.

    4.05×10−74.05 \times 10^{-7}

    B.

    4.05×10−64.05 \times 10^{-6}

    C.

    40.5×10−840.5 \times 10^{-8}

    D.

    4.05×10−84.05 \times 10^{-8}

Download the worksheet for Number - Scientific Notation to practice offline. It includes additional chapter-level practice questions.

Ratios and Proportions

Subtopic

Ratios and Proportions under Number for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    The ratio 3:73:7 is equivalent to 15:y15:y. What is the value of yy?

    A.

    2121

    B.

    3535

    C.

    4545

    D.

    2525

  2. 2.

    If the ratio of boys to girls in a school is 4:54:5 and there are 200200 boys, how many girls are there?

    A.

    250250

    B.

    160160

    C.

    225225

    D.

    180180

  3. 3.

    In a box of 4040 pens, 25%25\% are red. What is the ratio of red pens to non-red pens?

    A.

    1:41:4

    B.

    1:21:2

    C.

    3:13:1

    D.

    1:31:3

Download the worksheet for Number - Ratios and Proportions to practice offline. It includes additional chapter-level practice questions.

Percentages, Profit, Loss, and Simple Interest

Subtopic

Percentages, Profit, Loss, and Simple Interest under Number for Grade 8 IB.

About Topic & Revision

Preview questions (no answers)

  1. 1.

    A car is bought for $5,000\$5,000 and sold for $4,500\$4,500. What is the loss percentage?

    A.

    10%10\%

    B.

    5%5\%

    C.

    500%500\%

    D.

    15%15\%

  2. 2.

    If the selling price of a chair is $120\$120 and the profit made was $20\$20, what was the cost price?

    A.

    $140\$140

    B.

    $100\$100

    C.

    $120\$120

    D.

    $80\$80

  3. 3.

    Calculate 35%35\% of 200200.

    A.

    3535

    B.

    6060

    C.

    7070

    D.

    135135

Download the worksheet for Number - Percentages, Profit, Loss, and Simple Interest to practice offline. It includes additional chapter-level practice questions.

Number - IB Grade 8 Maths Notes & Revision | Krit.club