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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. 6 × x + 17 = 53. Find x.

    LHS=RHS
    6 · 17 · 53 · Missing-value equations

  2. 2. 6 × x + 11 = 47. Find x.

    LHS=RHS
    6 · 11 · 47 · Missing-value equations

  3. 3. 10 × x + 3 = 103. Find x.

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

  4. 4. 12 × x + 6 = 150. Find x.

    LHS=RHS
    12 · 6 · 150 · Missing-value equations

  5. 5. 5 × x + 19 = 44. Find x.

    LHS=RHS
    5 · 19 · 44 · Missing-value equations

  6. 6. 7 × x + 17 = 66. Find x.

    LHS=RHS
    7 · 17 · 66 · Missing-value equations

  7. 7. 12 × x + 3 = 147. Find x.

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

  8. 8. 4 × x + 13 = 29. Find x.

    LHS=RHS
    4 · 13 · 29 · Missing-value equations

  9. 9. 8 × x + 3 = 67. Find x.

    LHS=RHS
    8 · 3 · 67 · Missing-value equations

  10. 10. 10 × x + 20 = 120. Find x.

    LHS=RHS
    10 · 20 · 120 · Missing-value equations

  11. 11. 8 × x + 19 = 83. Find x.

    LHS=RHS
    8 · 19 · 83 · Missing-value equations

  12. 12. 6 × x + 20 = 56. Find x.

    LHS=RHS
    6 · 20 · 56 · Missing-value equations
12 questions · Seed 55 · 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. 6 × x + 17 = 53. Find x.

    6

    Subtract 17, then divide by 6: x = 6.

  2. 2. 6 × x + 11 = 47. Find x.

    6

    Subtract 11, then divide by 6: x = 6.

  3. 3. 10 × x + 3 = 103. Find x.

    10

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

  4. 4. 12 × x + 6 = 150. Find x.

    12

    Subtract 6, then divide by 12: x = 12.

  5. 5. 5 × x + 19 = 44. Find x.

    5

    Subtract 19, then divide by 5: x = 5.

  6. 6. 7 × x + 17 = 66. Find x.

    7

    Subtract 17, then divide by 7: x = 7.

  7. 7. 12 × x + 3 = 147. Find x.

    12

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

  8. 8. 4 × x + 13 = 29. Find x.

    4

    Subtract 13, then divide by 4: x = 4.

  9. 9. 8 × x + 3 = 67. Find x.

    8

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

  10. 10. 10 × x + 20 = 120. Find x.

    10

    Subtract 20, then divide by 10: x = 10.

  11. 11. 8 × x + 19 = 83. Find x.

    8

    Subtract 19, then divide by 8: x = 8.

  12. 12. 6 × x + 20 = 56. Find x.

    6

    Subtract 20, then divide by 6: x = 6.

12 questions · Seed 55 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 6 × x + 17 = 53. Find x.

    LHS=RHS
    6 · 17 · 53 · Missing-value equations

  2. 2. 6 × x + 11 = 47. Find x.

    LHS=RHS
    6 · 11 · 47 · Missing-value equations

  3. 3. 10 × x + 3 = 103. Find x.

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

  4. 4. 12 × x + 6 = 150. Find x.

    LHS=RHS
    12 · 6 · 150 · Missing-value equations

  5. 5. 5 × x + 19 = 44. Find x.

    LHS=RHS
    5 · 19 · 44 · Missing-value equations

  6. 6. 7 × x + 17 = 66. Find x.

    LHS=RHS
    7 · 17 · 66 · Missing-value equations

  7. 7. 12 × x + 3 = 147. Find x.

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

  8. 8. 4 × x + 13 = 29. Find x.

    LHS=RHS
    4 · 13 · 29 · Missing-value equations

  9. 9. 8 × x + 3 = 67. Find x.

    LHS=RHS
    8 · 3 · 67 · Missing-value equations

  10. 10. 10 × x + 20 = 120. Find x.

    LHS=RHS
    10 · 20 · 120 · Missing-value equations

  11. 11. 8 × x + 19 = 83. Find x.

    LHS=RHS
    8 · 19 · 83 · Missing-value equations

  12. 12. 6 × x + 20 = 56. Find x.

    LHS=RHS
    6 · 20 · 56 · Missing-value equations
12 questions · Seed 55 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 6 × x + 17 = 53. Find x.

    6

    Subtract 17, then divide by 6: x = 6.

  2. 2. 6 × x + 11 = 47. Find x.

    6

    Subtract 11, then divide by 6: x = 6.

  3. 3. 10 × x + 3 = 103. Find x.

    10

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

  4. 4. 12 × x + 6 = 150. Find x.

    12

    Subtract 6, then divide by 12: x = 12.

  5. 5. 5 × x + 19 = 44. Find x.

    5

    Subtract 19, then divide by 5: x = 5.

  6. 6. 7 × x + 17 = 66. Find x.

    7

    Subtract 17, then divide by 7: x = 7.

  7. 7. 12 × x + 3 = 147. Find x.

    12

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

  8. 8. 4 × x + 13 = 29. Find x.

    4

    Subtract 13, then divide by 4: x = 4.

  9. 9. 8 × x + 3 = 67. Find x.

    8

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

  10. 10. 10 × x + 20 = 120. Find x.

    10

    Subtract 20, then divide by 10: x = 10.

  11. 11. 8 × x + 19 = 83. Find x.

    8

    Subtract 19, then divide by 8: x = 8.

  12. 12. 6 × x + 20 = 56. Find x.

    6

    Subtract 20, then divide by 6: x = 6.

12 questions · Seed 55 · Age guidance, not curriculum certification