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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. 9 × x + 8 = 89. Find x.

    LHS=RHS
    9 · 8 · 89 · Missing-value equations

  2. 2. 10 × x + 18 = 118. Find x.

    LHS=RHS
    10 · 18 · 118 · Missing-value equations

  3. 3. 4 × x + 14 = 30. Find x.

    LHS=RHS
    4 · 14 · 30 · Missing-value equations

  4. 4. 12 × x + 4 = 148. Find x.

    LHS=RHS
    12 · 4 · 148 · Missing-value equations

  5. 5. 7 × x + 9 = 58. Find x.

    LHS=RHS
    7 · 9 · 58 · Missing-value equations

  6. 6. 11 × x + 10 = 131. Find x.

    LHS=RHS
    11 · 10 · 131 · Missing-value equations

  7. 7. 5 × x + 8 = 33. Find x.

    LHS=RHS
    5 · 8 · 33 · Missing-value equations

  8. 8. 11 × x + 17 = 138. Find x.

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

  9. 9. 7 × x + 10 = 59. Find x.

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

  10. 10. 6 × x + 16 = 52. Find x.

    LHS=RHS
    6 · 16 · 52 · Missing-value equations

  11. 11. 7 × x + 2 = 51. Find x.

    LHS=RHS
    7 · 2 · 51 · Missing-value equations

  12. 12. 4 × x + 17 = 33. Find x.

    LHS=RHS
    4 · 17 · 33 · Missing-value equations
12 questions · Seed 104742 · 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. 9 × x + 8 = 89. Find x.

    9

    Subtract 8, then divide by 9: x = 9.

  2. 2. 10 × x + 18 = 118. Find x.

    10

    Subtract 18, then divide by 10: x = 10.

  3. 3. 4 × x + 14 = 30. Find x.

    4

    Subtract 14, then divide by 4: x = 4.

  4. 4. 12 × x + 4 = 148. Find x.

    12

    Subtract 4, then divide by 12: x = 12.

  5. 5. 7 × x + 9 = 58. Find x.

    7

    Subtract 9, then divide by 7: x = 7.

  6. 6. 11 × x + 10 = 131. Find x.

    11

    Subtract 10, then divide by 11: x = 11.

  7. 7. 5 × x + 8 = 33. Find x.

    5

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

  8. 8. 11 × x + 17 = 138. Find x.

    11

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

  9. 9. 7 × x + 10 = 59. Find x.

    7

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

  10. 10. 6 × x + 16 = 52. Find x.

    6

    Subtract 16, then divide by 6: x = 6.

  11. 11. 7 × x + 2 = 51. Find x.

    7

    Subtract 2, then divide by 7: x = 7.

  12. 12. 4 × x + 17 = 33. Find x.

    4

    Subtract 17, then divide by 4: x = 4.

12 questions · Seed 104742 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 9 × x + 8 = 89. Find x.

    LHS=RHS
    9 · 8 · 89 · Missing-value equations

  2. 2. 10 × x + 18 = 118. Find x.

    LHS=RHS
    10 · 18 · 118 · Missing-value equations

  3. 3. 4 × x + 14 = 30. Find x.

    LHS=RHS
    4 · 14 · 30 · Missing-value equations

  4. 4. 12 × x + 4 = 148. Find x.

    LHS=RHS
    12 · 4 · 148 · Missing-value equations

  5. 5. 7 × x + 9 = 58. Find x.

    LHS=RHS
    7 · 9 · 58 · Missing-value equations

  6. 6. 11 × x + 10 = 131. Find x.

    LHS=RHS
    11 · 10 · 131 · Missing-value equations

  7. 7. 5 × x + 8 = 33. Find x.

    LHS=RHS
    5 · 8 · 33 · Missing-value equations

  8. 8. 11 × x + 17 = 138. Find x.

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

  9. 9. 7 × x + 10 = 59. Find x.

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

  10. 10. 6 × x + 16 = 52. Find x.

    LHS=RHS
    6 · 16 · 52 · Missing-value equations

  11. 11. 7 × x + 2 = 51. Find x.

    LHS=RHS
    7 · 2 · 51 · Missing-value equations

  12. 12. 4 × x + 17 = 33. Find x.

    LHS=RHS
    4 · 17 · 33 · Missing-value equations
12 questions · Seed 104742 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 9 × x + 8 = 89. Find x.

    9

    Subtract 8, then divide by 9: x = 9.

  2. 2. 10 × x + 18 = 118. Find x.

    10

    Subtract 18, then divide by 10: x = 10.

  3. 3. 4 × x + 14 = 30. Find x.

    4

    Subtract 14, then divide by 4: x = 4.

  4. 4. 12 × x + 4 = 148. Find x.

    12

    Subtract 4, then divide by 12: x = 12.

  5. 5. 7 × x + 9 = 58. Find x.

    7

    Subtract 9, then divide by 7: x = 7.

  6. 6. 11 × x + 10 = 131. Find x.

    11

    Subtract 10, then divide by 11: x = 11.

  7. 7. 5 × x + 8 = 33. Find x.

    5

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

  8. 8. 11 × x + 17 = 138. Find x.

    11

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

  9. 9. 7 × x + 10 = 59. Find x.

    7

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

  10. 10. 6 × x + 16 = 52. Find x.

    6

    Subtract 16, then divide by 6: x = 6.

  11. 11. 7 × x + 2 = 51. Find x.

    7

    Subtract 2, then divide by 7: x = 7.

  12. 12. 4 × x + 17 = 33. Find x.

    4

    Subtract 17, then divide by 4: x = 4.

12 questions · Seed 104742 · Age guidance, not curriculum certification