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MathsAges 10-12

Missing-value equations

Find the missing value that makes an equation true, then check by substitution. Review suitability for your learners before teaching.

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Age band:Ages 7-9Ages 10-12

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Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 10 × x + 3 = 103. Find x.

    LHS=RHS
    10 · 3 · 103 · Missing-value equations

  2. 2. 5 × x + 5 = 30. Find x.

    LHS=RHS
    5 · 5 · 30 · Missing-value equations

  3. 3. 12 × x + 3 = 147. Find x.

    LHS=RHS
    12 · 3 · 147 · Missing-value equations

  4. 4. 3 × x + 2 = 11. Find x.

    LHS=RHS
    3 · 2 · 11 · Missing-value equations

  5. 5. 3 × x + 10 = 19. Find x.

    LHS=RHS
    3 · 10 · 19 · Missing-value equations

  6. 6. 6 × x + 4 = 40. Find x.

    LHS=RHS
    6 · 4 · 40 · Missing-value equations

  7. 7. 8 × x + 11 = 75. Find x.

    LHS=RHS
    8 · 11 · 75 · Missing-value equations

  8. 8. 4 × x + 6 = 22. Find x.

    LHS=RHS
    4 · 6 · 22 · Missing-value equations

  9. 9. 8 × x + 6 = 70. Find x.

    LHS=RHS
    8 · 6 · 70 · Missing-value equations

  10. 10. 7 × x + 11 = 60. Find x.

    LHS=RHS
    7 · 11 · 60 · Missing-value equations

  11. 11. 2 × x + 14 = 18. Find x.

    LHS=RHS
    2 · 14 · 18 · Missing-value equations

  12. 12. 12 × x + 7 = 151. Find x.

    LHS=RHS
    12 · 7 · 151 · Missing-value equations
12 questions · Seed 104733 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 10 × x + 3 = 103. Find x.

    10

    Subtract 3, then divide by 10: x = 10.

  2. 2. 5 × x + 5 = 30. Find x.

    5

    Subtract 5, then divide by 5: x = 5.

  3. 3. 12 × x + 3 = 147. Find x.

    12

    Subtract 3, then divide by 12: x = 12.

  4. 4. 3 × x + 2 = 11. Find x.

    3

    Subtract 2, then divide by 3: x = 3.

  5. 5. 3 × x + 10 = 19. Find x.

    3

    Subtract 10, then divide by 3: x = 3.

  6. 6. 6 × x + 4 = 40. Find x.

    6

    Subtract 4, then divide by 6: x = 6.

  7. 7. 8 × x + 11 = 75. Find x.

    8

    Subtract 11, then divide by 8: x = 8.

  8. 8. 4 × x + 6 = 22. Find x.

    4

    Subtract 6, then divide by 4: x = 4.

  9. 9. 8 × x + 6 = 70. Find x.

    8

    Subtract 6, then divide by 8: x = 8.

  10. 10. 7 × x + 11 = 60. Find x.

    7

    Subtract 11, then divide by 7: x = 7.

  11. 11. 2 × x + 14 = 18. Find x.

    2

    Subtract 14, then divide by 2: x = 2.

  12. 12. 12 × x + 7 = 151. Find x.

    12

    Subtract 7, then divide by 12: x = 12.

12 questions · Seed 104733 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 10 × x + 3 = 103. Find x.

    LHS=RHS
    10 · 3 · 103 · Missing-value equations

  2. 2. 5 × x + 5 = 30. Find x.

    LHS=RHS
    5 · 5 · 30 · Missing-value equations

  3. 3. 12 × x + 3 = 147. Find x.

    LHS=RHS
    12 · 3 · 147 · Missing-value equations

  4. 4. 3 × x + 2 = 11. Find x.

    LHS=RHS
    3 · 2 · 11 · Missing-value equations

  5. 5. 3 × x + 10 = 19. Find x.

    LHS=RHS
    3 · 10 · 19 · Missing-value equations

  6. 6. 6 × x + 4 = 40. Find x.

    LHS=RHS
    6 · 4 · 40 · Missing-value equations

  7. 7. 8 × x + 11 = 75. Find x.

    LHS=RHS
    8 · 11 · 75 · Missing-value equations

  8. 8. 4 × x + 6 = 22. Find x.

    LHS=RHS
    4 · 6 · 22 · Missing-value equations

  9. 9. 8 × x + 6 = 70. Find x.

    LHS=RHS
    8 · 6 · 70 · Missing-value equations

  10. 10. 7 × x + 11 = 60. Find x.

    LHS=RHS
    7 · 11 · 60 · Missing-value equations

  11. 11. 2 × x + 14 = 18. Find x.

    LHS=RHS
    2 · 14 · 18 · Missing-value equations

  12. 12. 12 × x + 7 = 151. Find x.

    LHS=RHS
    12 · 7 · 151 · Missing-value equations
12 questions · Seed 104733 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 10 × x + 3 = 103. Find x.

    10

    Subtract 3, then divide by 10: x = 10.

  2. 2. 5 × x + 5 = 30. Find x.

    5

    Subtract 5, then divide by 5: x = 5.

  3. 3. 12 × x + 3 = 147. Find x.

    12

    Subtract 3, then divide by 12: x = 12.

  4. 4. 3 × x + 2 = 11. Find x.

    3

    Subtract 2, then divide by 3: x = 3.

  5. 5. 3 × x + 10 = 19. Find x.

    3

    Subtract 10, then divide by 3: x = 3.

  6. 6. 6 × x + 4 = 40. Find x.

    6

    Subtract 4, then divide by 6: x = 6.

  7. 7. 8 × x + 11 = 75. Find x.

    8

    Subtract 11, then divide by 8: x = 8.

  8. 8. 4 × x + 6 = 22. Find x.

    4

    Subtract 6, then divide by 4: x = 4.

  9. 9. 8 × x + 6 = 70. Find x.

    8

    Subtract 6, then divide by 8: x = 8.

  10. 10. 7 × x + 11 = 60. Find x.

    7

    Subtract 11, then divide by 7: x = 7.

  11. 11. 2 × x + 14 = 18. Find x.

    2

    Subtract 14, then divide by 2: x = 2.

  12. 12. 12 × x + 7 = 151. Find x.

    12

    Subtract 7, then divide by 12: x = 12.

12 questions · Seed 104733 · Age guidance, not curriculum certification