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About Number Operations — Class 6 IB

Build fluency with the four operations on whole numbers and explore order of operations. This topic is part of the IB Class 6 mathematics syllabus (chapter: Unit 1). On this page you can practice 60 questions across three difficulty levels — 20 easy, 20 medium, and 20 hard — each with a visual step-by-step solution, plus a timed 35-question mastery test with a live leaderboard. Worked examples and sample questions from the topic are below.

What you'll learn in Number Operations

  • Exploring the Four Operations
  • Order of Operations (BODMAS/PEMDAS)
  • Factors and Multiples
  • Prime Numbers and Prime Factorisation
  • Divisibility Rules and Review

Interactive lesson · about 20 minutes · checkpoint question after every unit

Number Operations — solved examples for Class 6 IB

Example 1easy

What is 347 + 258?
  1. A)595
  2. B)605
  3. C)615
  4. D)585

Step-by-step solution

  1. Add ones: 7 + 8 = 15, write 5, carry 1.
  2. Add tens: 4 + 5 + 1 = 10, write 0, carry 1.
  3. Add hundreds: 3 + 2 + 1 = 6.
    347+258=605347 + 258 = 605

Answer: 605

Example 2medium

Evaluate: 48 / (16 - 8) + 3 x 5
  1. A)21
  2. B)45
  3. C)18
  4. D)33

Step-by-step solution

  1. Brackets:
    16−8=816 - 8 = 8
  2. Division:
    48/8=648 / 8 = 6
  3. Multiplication:
    3x5=153 x 5 = 15
  4. Addition:
    6+15=216 + 15 = 21

Answer: 21

Example 3hard

Evaluate: 4 x [18 - (3 + 5)] + 12 / 6
  1. A)42
  2. B)44
  3. C)40
  4. D)38

Step-by-step solution

  1. Innermost brackets:
    3+5=83 + 5 = 8
  2. Outer brackets:
    18−8=1018 - 8 = 10
  3. Multiply:
    4x10=404 x 10 = 40
  4. Divide:
    12/6=212 / 6 = 2
  5. Add:
    40+2=4240 + 2 = 42

Answer: 42

Practice questions on Number Operations

  1. Q1.easy

    Calculate 803 - 467.
    1. A)336
    2. B)346
    3. C)436
    4. D)326
    Show answer

    Answer: 336

    Hint: You will need to borrow from the hundreds place since 0 < 6 in the tens column.

  2. Q2.easy

    What is 45 x 12?
    1. A)520
    2. B)540
    3. C)450
    4. D)560
    Show answer

    Answer: 540

    Hint: Break it into 45 x 10 + 45 x 2.

  3. Q3.easy

    Divide 936 by 8.
    1. A)107
    2. B)117
    3. C)112
    4. D)127
    Show answer

    Answer: 117

    Hint: How many times does 8 go into 9, then into 13, then into 56?

  4. Q4.medium

    A baker made 1,248 cookies. She packs them equally into 24 boxes. How many cookies are in each box?
    1. A)48
    2. B)52
    3. C)56
    4. D)62
    Show answer

    Answer: 52

    Hint: Divide the total cookies by the number of boxes.

  5. Q5.medium

    Estimate the value of 6,189 - 2,843 by rounding to the nearest thousand.
    1. A)3,000
    2. B)3,500
    3. C)4,000
    4. D)2,500
    Show answer

    Answer: 3,000

    Hint: Round 6,189 to 6,000 and 2,843 to 3,000.

  6. Q6.medium

    Evaluate: 5 x (18 - 6) / 4 + 7
    1. A)22
    2. B)17
    3. C)20
    4. D)25
    Show answer

    Answer: 22

    Hint: Brackets first, then multiply and divide left to right, then add.

  7. Q7.hard

    A shop sold 1,875 items over 5 days. On Monday they sold 423, Tuesday 356, Wednesday 412, and Thursday 298. How many items were sold on Friday?
    1. A)386
    2. B)396
    3. C)376
    4. D)406
    Show answer

    Answer: 386

    Hint: Add the items sold Monday through Thursday, then subtract from the total.

  8. Q8.hard

    Evaluate: (8 + 2)^2 / (15 - 10) - 3 x 4
    1. A)8
    2. B)10
    3. C)6
    4. D)12
    Show answer

    Answer: 8

    Hint: Brackets first, then powers, then division and multiplication, then subtraction.

  9. Q9.hard

    Three friends share a bill of $247.50 equally. How much does each person pay?
    1. A)$82.00
    2. B)$82.50
    3. C)$83.00
    4. D)$81.50
    Show answer

    Answer: $82.50

    Hint: Divide the total bill by 3.

These are 9 of the 60 questions available for Number Operations. Start practicing above to unlock visual solutions, AI coaching, and the topic leaderboard — completely free.