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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. 12 × x + 20 = 164. Find x.

    LHS=RHS
    12 · 20 · 164 · Missing-value equations

  2. 2. 5 × x + 4 = 29. Find x.

    LHS=RHS
    5 · 4 · 29 · Missing-value equations

  3. 3. 8 × x + 12 = 76. Find x.

    LHS=RHS
    8 · 12 · 76 · Missing-value equations

  4. 4. 8 × x + 3 = 67. Find x.

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

  5. 5. 4 × x + 7 = 23. Find x.

    LHS=RHS
    4 · 7 · 23 · Missing-value equations

  6. 6. 9 × x + 12 = 93. Find x.

    LHS=RHS
    9 · 12 · 93 · Missing-value equations

  7. 7. 7 × x + 15 = 64. Find x.

    LHS=RHS
    7 · 15 · 64 · Missing-value equations

  8. 8. 5 × x + 14 = 39. Find x.

    LHS=RHS
    5 · 14 · 39 · Missing-value equations

  9. 9. 3 × x + 6 = 15. Find x.

    LHS=RHS
    3 · 6 · 15 · Missing-value equations

  10. 10. 6 × x + 12 = 48. Find x.

    LHS=RHS
    6 · 12 · 48 · Missing-value equations

  11. 11. 11 × x + 16 = 137. Find x.

    LHS=RHS
    11 · 16 · 137 · Missing-value equations

  12. 12. 8 × x + 5 = 69. Find x.

    LHS=RHS
    8 · 5 · 69 · Missing-value equations
12 questions · Seed 43 · 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. 12 × x + 20 = 164. Find x.

    12

    Subtract 20, then divide by 12: x = 12.

  2. 2. 5 × x + 4 = 29. Find x.

    5

    Subtract 4, then divide by 5: x = 5.

  3. 3. 8 × x + 12 = 76. Find x.

    8

    Subtract 12, then divide by 8: x = 8.

  4. 4. 8 × x + 3 = 67. Find x.

    8

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

  5. 5. 4 × x + 7 = 23. Find x.

    4

    Subtract 7, then divide by 4: x = 4.

  6. 6. 9 × x + 12 = 93. Find x.

    9

    Subtract 12, then divide by 9: x = 9.

  7. 7. 7 × x + 15 = 64. Find x.

    7

    Subtract 15, then divide by 7: x = 7.

  8. 8. 5 × x + 14 = 39. Find x.

    5

    Subtract 14, then divide by 5: x = 5.

  9. 9. 3 × x + 6 = 15. Find x.

    3

    Subtract 6, then divide by 3: x = 3.

  10. 10. 6 × x + 12 = 48. Find x.

    6

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

  11. 11. 11 × x + 16 = 137. Find x.

    11

    Subtract 16, then divide by 11: x = 11.

  12. 12. 8 × x + 5 = 69. Find x.

    8

    Subtract 5, then divide by 8: x = 8.

12 questions · Seed 43 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 12 × x + 20 = 164. Find x.

    LHS=RHS
    12 · 20 · 164 · Missing-value equations

  2. 2. 5 × x + 4 = 29. Find x.

    LHS=RHS
    5 · 4 · 29 · Missing-value equations

  3. 3. 8 × x + 12 = 76. Find x.

    LHS=RHS
    8 · 12 · 76 · Missing-value equations

  4. 4. 8 × x + 3 = 67. Find x.

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

  5. 5. 4 × x + 7 = 23. Find x.

    LHS=RHS
    4 · 7 · 23 · Missing-value equations

  6. 6. 9 × x + 12 = 93. Find x.

    LHS=RHS
    9 · 12 · 93 · Missing-value equations

  7. 7. 7 × x + 15 = 64. Find x.

    LHS=RHS
    7 · 15 · 64 · Missing-value equations

  8. 8. 5 × x + 14 = 39. Find x.

    LHS=RHS
    5 · 14 · 39 · Missing-value equations

  9. 9. 3 × x + 6 = 15. Find x.

    LHS=RHS
    3 · 6 · 15 · Missing-value equations

  10. 10. 6 × x + 12 = 48. Find x.

    LHS=RHS
    6 · 12 · 48 · Missing-value equations

  11. 11. 11 × x + 16 = 137. Find x.

    LHS=RHS
    11 · 16 · 137 · Missing-value equations

  12. 12. 8 × x + 5 = 69. Find x.

    LHS=RHS
    8 · 5 · 69 · Missing-value equations
12 questions · Seed 43 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 12 × x + 20 = 164. Find x.

    12

    Subtract 20, then divide by 12: x = 12.

  2. 2. 5 × x + 4 = 29. Find x.

    5

    Subtract 4, then divide by 5: x = 5.

  3. 3. 8 × x + 12 = 76. Find x.

    8

    Subtract 12, then divide by 8: x = 8.

  4. 4. 8 × x + 3 = 67. Find x.

    8

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

  5. 5. 4 × x + 7 = 23. Find x.

    4

    Subtract 7, then divide by 4: x = 4.

  6. 6. 9 × x + 12 = 93. Find x.

    9

    Subtract 12, then divide by 9: x = 9.

  7. 7. 7 × x + 15 = 64. Find x.

    7

    Subtract 15, then divide by 7: x = 7.

  8. 8. 5 × x + 14 = 39. Find x.

    5

    Subtract 14, then divide by 5: x = 5.

  9. 9. 3 × x + 6 = 15. Find x.

    3

    Subtract 6, then divide by 3: x = 3.

  10. 10. 6 × x + 12 = 48. Find x.

    6

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

  11. 11. 11 × x + 16 = 137. Find x.

    11

    Subtract 16, then divide by 11: x = 11.

  12. 12. 8 × x + 5 = 69. Find x.

    8

    Subtract 5, then divide by 8: x = 8.

12 questions · Seed 43 · Age guidance, not curriculum certification