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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. 2 × x + 16 = 20. Find x.

    LHS=RHS
    2 · 16 · 20 · Missing-value equations

  2. 2. 8 × x + 3 = 67. Find x.

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

  3. 3. 3 × x + 16 = 25. Find x.

    LHS=RHS
    3 · 16 · 25 · Missing-value equations

  4. 4. 2 × x + 18 = 22. Find x.

    LHS=RHS
    2 · 18 · 22 · Missing-value equations

  5. 5. 12 × x + 2 = 146. Find x.

    LHS=RHS
    12 · 2 · 146 · Missing-value equations

  6. 6. 2 × x + 12 = 16. Find x.

    LHS=RHS
    2 · 12 · 16 · Missing-value equations

  7. 7. 12 × x + 17 = 161. Find x.

    LHS=RHS
    12 · 17 · 161 · Missing-value equations

  8. 8. 7 × x + 15 = 64. Find x.

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

  9. 9. 11 × x + 14 = 135. Find x.

    LHS=RHS
    11 · 14 · 135 · Missing-value equations

  10. 10. 4 × x + 13 = 29. Find x.

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

  11. 11. 7 × x + 10 = 59. Find x.

    LHS=RHS
    7 · 10 · 59 · Missing-value equations

  12. 12. 8 × x + 6 = 70. Find x.

    LHS=RHS
    8 · 6 · 70 · Missing-value equations
12 questions · Seed 46 · 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. 2 × x + 16 = 20. Find x.

    2

    Subtract 16, then divide by 2: x = 2.

  2. 2. 8 × x + 3 = 67. Find x.

    8

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

  3. 3. 3 × x + 16 = 25. Find x.

    3

    Subtract 16, then divide by 3: x = 3.

  4. 4. 2 × x + 18 = 22. Find x.

    2

    Subtract 18, then divide by 2: x = 2.

  5. 5. 12 × x + 2 = 146. Find x.

    12

    Subtract 2, then divide by 12: x = 12.

  6. 6. 2 × x + 12 = 16. Find x.

    2

    Subtract 12, then divide by 2: x = 2.

  7. 7. 12 × x + 17 = 161. Find x.

    12

    Subtract 17, then divide by 12: x = 12.

  8. 8. 7 × x + 15 = 64. Find x.

    7

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

  9. 9. 11 × x + 14 = 135. Find x.

    11

    Subtract 14, then divide by 11: x = 11.

  10. 10. 4 × x + 13 = 29. Find x.

    4

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

  11. 11. 7 × x + 10 = 59. Find x.

    7

    Subtract 10, then divide by 7: x = 7.

  12. 12. 8 × x + 6 = 70. Find x.

    8

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

12 questions · Seed 46 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 2 × x + 16 = 20. Find x.

    LHS=RHS
    2 · 16 · 20 · Missing-value equations

  2. 2. 8 × x + 3 = 67. Find x.

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

  3. 3. 3 × x + 16 = 25. Find x.

    LHS=RHS
    3 · 16 · 25 · Missing-value equations

  4. 4. 2 × x + 18 = 22. Find x.

    LHS=RHS
    2 · 18 · 22 · Missing-value equations

  5. 5. 12 × x + 2 = 146. Find x.

    LHS=RHS
    12 · 2 · 146 · Missing-value equations

  6. 6. 2 × x + 12 = 16. Find x.

    LHS=RHS
    2 · 12 · 16 · Missing-value equations

  7. 7. 12 × x + 17 = 161. Find x.

    LHS=RHS
    12 · 17 · 161 · Missing-value equations

  8. 8. 7 × x + 15 = 64. Find x.

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

  9. 9. 11 × x + 14 = 135. Find x.

    LHS=RHS
    11 · 14 · 135 · Missing-value equations

  10. 10. 4 × x + 13 = 29. Find x.

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

  11. 11. 7 × x + 10 = 59. Find x.

    LHS=RHS
    7 · 10 · 59 · Missing-value equations

  12. 12. 8 × x + 6 = 70. Find x.

    LHS=RHS
    8 · 6 · 70 · Missing-value equations
12 questions · Seed 46 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 2 × x + 16 = 20. Find x.

    2

    Subtract 16, then divide by 2: x = 2.

  2. 2. 8 × x + 3 = 67. Find x.

    8

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

  3. 3. 3 × x + 16 = 25. Find x.

    3

    Subtract 16, then divide by 3: x = 3.

  4. 4. 2 × x + 18 = 22. Find x.

    2

    Subtract 18, then divide by 2: x = 2.

  5. 5. 12 × x + 2 = 146. Find x.

    12

    Subtract 2, then divide by 12: x = 12.

  6. 6. 2 × x + 12 = 16. Find x.

    2

    Subtract 12, then divide by 2: x = 2.

  7. 7. 12 × x + 17 = 161. Find x.

    12

    Subtract 17, then divide by 12: x = 12.

  8. 8. 7 × x + 15 = 64. Find x.

    7

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

  9. 9. 11 × x + 14 = 135. Find x.

    11

    Subtract 14, then divide by 11: x = 11.

  10. 10. 4 × x + 13 = 29. Find x.

    4

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

  11. 11. 7 × x + 10 = 59. Find x.

    7

    Subtract 10, then divide by 7: x = 7.

  12. 12. 8 × x + 6 = 70. Find x.

    8

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

12 questions · Seed 46 · Age guidance, not curriculum certification