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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 + 12 = 48. Find x.

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

  2. 2. 6 × x + 9 = 45. Find x.

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

  3. 3. 12 × x + 6 = 150. Find x.

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

  4. 4. 10 × x + 10 = 110. Find x.

    LHS=RHS
    10 · 10 · 110 · Missing-value equations

  5. 5. 3 × x + 9 = 18. Find x.

    LHS=RHS
    3 · 9 · 18 · Missing-value equations

  6. 6. 5 × x + 14 = 39. Find x.

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

  7. 7. 5 × x + 5 = 30. Find x.

    LHS=RHS
    5 · 5 · 30 · Missing-value equations

  8. 8. 5 × x + 2 = 27. Find x.

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

  9. 9. 11 × x + 2 = 123. Find x.

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

  10. 10. 11 × x + 17 = 138. Find x.

    LHS=RHS
    11 · 17 · 138 · Missing-value equations

  11. 11. 5 × x + 18 = 43. Find x.

    LHS=RHS
    5 · 18 · 43 · Missing-value equations

  12. 12. 3 × x + 20 = 29. Find x.

    LHS=RHS
    3 · 20 · 29 · Missing-value equations
12 questions · Seed 104738 · 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 + 12 = 48. Find x.

    6

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

  2. 2. 6 × x + 9 = 45. Find x.

    6

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

  3. 3. 12 × x + 6 = 150. Find x.

    12

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

  4. 4. 10 × x + 10 = 110. Find x.

    10

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

  5. 5. 3 × x + 9 = 18. Find x.

    3

    Subtract 9, then divide by 3: x = 3.

  6. 6. 5 × x + 14 = 39. Find x.

    5

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

  7. 7. 5 × x + 5 = 30. Find x.

    5

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

  8. 8. 5 × x + 2 = 27. Find x.

    5

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

  9. 9. 11 × x + 2 = 123. Find x.

    11

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

  10. 10. 11 × x + 17 = 138. Find x.

    11

    Subtract 17, then divide by 11: x = 11.

  11. 11. 5 × x + 18 = 43. Find x.

    5

    Subtract 18, then divide by 5: x = 5.

  12. 12. 3 × x + 20 = 29. Find x.

    3

    Subtract 20, then divide by 3: x = 3.

12 questions · Seed 104738 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 6 × x + 12 = 48. Find x.

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

  2. 2. 6 × x + 9 = 45. Find x.

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

  3. 3. 12 × x + 6 = 150. Find x.

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

  4. 4. 10 × x + 10 = 110. Find x.

    LHS=RHS
    10 · 10 · 110 · Missing-value equations

  5. 5. 3 × x + 9 = 18. Find x.

    LHS=RHS
    3 · 9 · 18 · Missing-value equations

  6. 6. 5 × x + 14 = 39. Find x.

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

  7. 7. 5 × x + 5 = 30. Find x.

    LHS=RHS
    5 · 5 · 30 · Missing-value equations

  8. 8. 5 × x + 2 = 27. Find x.

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

  9. 9. 11 × x + 2 = 123. Find x.

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

  10. 10. 11 × x + 17 = 138. Find x.

    LHS=RHS
    11 · 17 · 138 · Missing-value equations

  11. 11. 5 × x + 18 = 43. Find x.

    LHS=RHS
    5 · 18 · 43 · Missing-value equations

  12. 12. 3 × x + 20 = 29. Find x.

    LHS=RHS
    3 · 20 · 29 · Missing-value equations
12 questions · Seed 104738 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 6 × x + 12 = 48. Find x.

    6

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

  2. 2. 6 × x + 9 = 45. Find x.

    6

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

  3. 3. 12 × x + 6 = 150. Find x.

    12

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

  4. 4. 10 × x + 10 = 110. Find x.

    10

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

  5. 5. 3 × x + 9 = 18. Find x.

    3

    Subtract 9, then divide by 3: x = 3.

  6. 6. 5 × x + 14 = 39. Find x.

    5

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

  7. 7. 5 × x + 5 = 30. Find x.

    5

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

  8. 8. 5 × x + 2 = 27. Find x.

    5

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

  9. 9. 11 × x + 2 = 123. Find x.

    11

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

  10. 10. 11 × x + 17 = 138. Find x.

    11

    Subtract 17, then divide by 11: x = 11.

  11. 11. 5 × x + 18 = 43. Find x.

    5

    Subtract 18, then divide by 5: x = 5.

  12. 12. 3 × x + 20 = 29. Find x.

    3

    Subtract 20, then divide by 3: x = 3.

12 questions · Seed 104738 · Age guidance, not curriculum certification