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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 + 8 = 57. Find x.

    LHS=RHS
    7 · 8 · 57 · Missing-value equations

  2. 2. 2 × x + 20 = 24. Find x.

    LHS=RHS
    2 · 20 · 24 · Missing-value equations

  3. 3. 8 × x + 2 = 66. Find x.

    LHS=RHS
    8 · 2 · 66 · Missing-value equations

  4. 4. 5 × x + 4 = 29. Find x.

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

  5. 5. 12 × x + 2 = 146. Find x.

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

  6. 6. 6 × x + 9 = 45. Find x.

    LHS=RHS
    6 · 9 · 45 · Missing-value equations

  7. 7. 4 × x + 20 = 36. Find x.

    LHS=RHS
    4 · 20 · 36 · Missing-value equations

  8. 8. 12 × x + 19 = 163. Find x.

    LHS=RHS
    12 · 19 · 163 · Missing-value equations

  9. 9. 6 × x + 5 = 41. Find x.

    LHS=RHS
    6 · 5 · 41 · Missing-value equations

  10. 10. 5 × x + 20 = 45. Find x.

    LHS=RHS
    5 · 20 · 45 · Missing-value equations

  11. 11. 5 × x + 2 = 27. Find x.

    LHS=RHS
    5 · 2 · 27 · Missing-value equations

  12. 12. 12 × x + 3 = 147. Find x.

    LHS=RHS
    12 · 3 · 147 · Missing-value equations
12 questions · Seed 104739 · 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 + 8 = 57. Find x.

    7

    Subtract 8, then divide by 7: x = 7.

  2. 2. 2 × x + 20 = 24. Find x.

    2

    Subtract 20, then divide by 2: x = 2.

  3. 3. 8 × x + 2 = 66. Find x.

    8

    Subtract 2, then divide by 8: x = 8.

  4. 4. 5 × x + 4 = 29. Find x.

    5

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

  5. 5. 12 × x + 2 = 146. Find x.

    12

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

  6. 6. 6 × x + 9 = 45. Find x.

    6

    Subtract 9, then divide by 6: x = 6.

  7. 7. 4 × x + 20 = 36. Find x.

    4

    Subtract 20, then divide by 4: x = 4.

  8. 8. 12 × x + 19 = 163. Find x.

    12

    Subtract 19, then divide by 12: x = 12.

  9. 9. 6 × x + 5 = 41. Find x.

    6

    Subtract 5, then divide by 6: x = 6.

  10. 10. 5 × x + 20 = 45. Find x.

    5

    Subtract 20, then divide by 5: x = 5.

  11. 11. 5 × x + 2 = 27. Find x.

    5

    Subtract 2, then divide by 5: x = 5.

  12. 12. 12 × x + 3 = 147. Find x.

    12

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

12 questions · Seed 104739 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 7 × x + 8 = 57. Find x.

    LHS=RHS
    7 · 8 · 57 · Missing-value equations

  2. 2. 2 × x + 20 = 24. Find x.

    LHS=RHS
    2 · 20 · 24 · Missing-value equations

  3. 3. 8 × x + 2 = 66. Find x.

    LHS=RHS
    8 · 2 · 66 · Missing-value equations

  4. 4. 5 × x + 4 = 29. Find x.

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

  5. 5. 12 × x + 2 = 146. Find x.

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

  6. 6. 6 × x + 9 = 45. Find x.

    LHS=RHS
    6 · 9 · 45 · Missing-value equations

  7. 7. 4 × x + 20 = 36. Find x.

    LHS=RHS
    4 · 20 · 36 · Missing-value equations

  8. 8. 12 × x + 19 = 163. Find x.

    LHS=RHS
    12 · 19 · 163 · Missing-value equations

  9. 9. 6 × x + 5 = 41. Find x.

    LHS=RHS
    6 · 5 · 41 · Missing-value equations

  10. 10. 5 × x + 20 = 45. Find x.

    LHS=RHS
    5 · 20 · 45 · Missing-value equations

  11. 11. 5 × x + 2 = 27. Find x.

    LHS=RHS
    5 · 2 · 27 · Missing-value equations

  12. 12. 12 × x + 3 = 147. Find x.

    LHS=RHS
    12 · 3 · 147 · Missing-value equations
12 questions · Seed 104739 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 7 × x + 8 = 57. Find x.

    7

    Subtract 8, then divide by 7: x = 7.

  2. 2. 2 × x + 20 = 24. Find x.

    2

    Subtract 20, then divide by 2: x = 2.

  3. 3. 8 × x + 2 = 66. Find x.

    8

    Subtract 2, then divide by 8: x = 8.

  4. 4. 5 × x + 4 = 29. Find x.

    5

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

  5. 5. 12 × x + 2 = 146. Find x.

    12

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

  6. 6. 6 × x + 9 = 45. Find x.

    6

    Subtract 9, then divide by 6: x = 6.

  7. 7. 4 × x + 20 = 36. Find x.

    4

    Subtract 20, then divide by 4: x = 4.

  8. 8. 12 × x + 19 = 163. Find x.

    12

    Subtract 19, then divide by 12: x = 12.

  9. 9. 6 × x + 5 = 41. Find x.

    6

    Subtract 5, then divide by 6: x = 6.

  10. 10. 5 × x + 20 = 45. Find x.

    5

    Subtract 20, then divide by 5: x = 5.

  11. 11. 5 × x + 2 = 27. Find x.

    5

    Subtract 2, then divide by 5: x = 5.

  12. 12. 12 × x + 3 = 147. Find x.

    12

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

12 questions · Seed 104739 · Age guidance, not curriculum certification