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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. 7 × x + 19 = 68. Find x.

    LHS=RHS
    7 · 19 · 68 · Missing-value equations

  2. 2. 6 × x + 19 = 55. Find x.

    LHS=RHS
    6 · 19 · 55 · Missing-value equations

  3. 3. 12 × x + 10 = 154. Find x.

    LHS=RHS
    12 · 10 · 154 · Missing-value equations

  4. 4. 6 × x + 6 = 42. Find x.

    LHS=RHS
    6 · 6 · 42 · Missing-value equations

  5. 5. 4 × x + 12 = 28. Find x.

    LHS=RHS
    4 · 12 · 28 · Missing-value equations

  6. 6. 6 × x + 7 = 43. Find x.

    LHS=RHS
    6 · 7 · 43 · Missing-value equations

  7. 7. 3 × x + 3 = 12. Find x.

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

  8. 8. 10 × x + 6 = 106. Find x.

    LHS=RHS
    10 · 6 · 106 · Missing-value equations

  9. 9. 4 × x + 3 = 19. Find x.

    LHS=RHS
    4 · 3 · 19 · Missing-value equations

  10. 10. 8 × x + 10 = 74. Find x.

    LHS=RHS
    8 · 10 · 74 · Missing-value equations

  11. 11. 11 × x + 2 = 123. Find x.

    LHS=RHS
    11 · 2 · 123 · Missing-value equations

  12. 12. 8 × x + 3 = 67. Find x.

    LHS=RHS
    8 · 3 · 67 · Missing-value equations
12 questions · Seed 47 · 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. 7 × x + 19 = 68. Find x.

    7

    Subtract 19, then divide by 7: x = 7.

  2. 2. 6 × x + 19 = 55. Find x.

    6

    Subtract 19, then divide by 6: x = 6.

  3. 3. 12 × x + 10 = 154. Find x.

    12

    Subtract 10, then divide by 12: x = 12.

  4. 4. 6 × x + 6 = 42. Find x.

    6

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

  5. 5. 4 × x + 12 = 28. Find x.

    4

    Subtract 12, then divide by 4: x = 4.

  6. 6. 6 × x + 7 = 43. Find x.

    6

    Subtract 7, then divide by 6: x = 6.

  7. 7. 3 × x + 3 = 12. Find x.

    3

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

  8. 8. 10 × x + 6 = 106. Find x.

    10

    Subtract 6, then divide by 10: x = 10.

  9. 9. 4 × x + 3 = 19. Find x.

    4

    Subtract 3, then divide by 4: x = 4.

  10. 10. 8 × x + 10 = 74. Find x.

    8

    Subtract 10, then divide by 8: x = 8.

  11. 11. 11 × x + 2 = 123. Find x.

    11

    Subtract 2, then divide by 11: x = 11.

  12. 12. 8 × x + 3 = 67. Find x.

    8

    Subtract 3, then divide by 8: x = 8.

12 questions · Seed 47 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 7 × x + 19 = 68. Find x.

    LHS=RHS
    7 · 19 · 68 · Missing-value equations

  2. 2. 6 × x + 19 = 55. Find x.

    LHS=RHS
    6 · 19 · 55 · Missing-value equations

  3. 3. 12 × x + 10 = 154. Find x.

    LHS=RHS
    12 · 10 · 154 · Missing-value equations

  4. 4. 6 × x + 6 = 42. Find x.

    LHS=RHS
    6 · 6 · 42 · Missing-value equations

  5. 5. 4 × x + 12 = 28. Find x.

    LHS=RHS
    4 · 12 · 28 · Missing-value equations

  6. 6. 6 × x + 7 = 43. Find x.

    LHS=RHS
    6 · 7 · 43 · Missing-value equations

  7. 7. 3 × x + 3 = 12. Find x.

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

  8. 8. 10 × x + 6 = 106. Find x.

    LHS=RHS
    10 · 6 · 106 · Missing-value equations

  9. 9. 4 × x + 3 = 19. Find x.

    LHS=RHS
    4 · 3 · 19 · Missing-value equations

  10. 10. 8 × x + 10 = 74. Find x.

    LHS=RHS
    8 · 10 · 74 · Missing-value equations

  11. 11. 11 × x + 2 = 123. Find x.

    LHS=RHS
    11 · 2 · 123 · Missing-value equations

  12. 12. 8 × x + 3 = 67. Find x.

    LHS=RHS
    8 · 3 · 67 · Missing-value equations
12 questions · Seed 47 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 7 × x + 19 = 68. Find x.

    7

    Subtract 19, then divide by 7: x = 7.

  2. 2. 6 × x + 19 = 55. Find x.

    6

    Subtract 19, then divide by 6: x = 6.

  3. 3. 12 × x + 10 = 154. Find x.

    12

    Subtract 10, then divide by 12: x = 12.

  4. 4. 6 × x + 6 = 42. Find x.

    6

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

  5. 5. 4 × x + 12 = 28. Find x.

    4

    Subtract 12, then divide by 4: x = 4.

  6. 6. 6 × x + 7 = 43. Find x.

    6

    Subtract 7, then divide by 6: x = 6.

  7. 7. 3 × x + 3 = 12. Find x.

    3

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

  8. 8. 10 × x + 6 = 106. Find x.

    10

    Subtract 6, then divide by 10: x = 10.

  9. 9. 4 × x + 3 = 19. Find x.

    4

    Subtract 3, then divide by 4: x = 4.

  10. 10. 8 × x + 10 = 74. Find x.

    8

    Subtract 10, then divide by 8: x = 8.

  11. 11. 11 × x + 2 = 123. Find x.

    11

    Subtract 2, then divide by 11: x = 11.

  12. 12. 8 × x + 3 = 67. Find x.

    8

    Subtract 3, then divide by 8: x = 8.

12 questions · Seed 47 · Age guidance, not curriculum certification