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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 + 5 = 54. Find x.

    LHS=RHS
    7 · 5 · 54 · Missing-value equations

  2. 2. 11 × x + 10 = 131. Find x.

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

  3. 3. 5 × x + 16 = 41. Find x.

    LHS=RHS
    5 · 16 · 41 · Missing-value equations

  4. 4. 5 × x + 20 = 45. Find x.

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

  5. 5. 11 × x + 5 = 126. Find x.

    LHS=RHS
    11 · 5 · 126 · Missing-value equations

  6. 6. 8 × x + 3 = 67. Find x.

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

  7. 7. 12 × x + 8 = 152. Find x.

    LHS=RHS
    12 · 8 · 152 · Missing-value equations

  8. 8. 10 × x + 18 = 118. Find x.

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

  9. 9. 6 × x + 8 = 44. Find x.

    LHS=RHS
    6 · 8 · 44 · Missing-value equations

  10. 10. 10 × x + 9 = 109. Find x.

    LHS=RHS
    10 · 9 · 109 · Missing-value equations

  11. 11. 7 × x + 7 = 56. Find x.

    LHS=RHS
    7 · 7 · 56 · Missing-value equations

  12. 12. 2 × x + 15 = 19. Find x.

    LHS=RHS
    2 · 15 · 19 · Missing-value equations
12 questions · Seed 57 · 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 + 5 = 54. Find x.

    7

    Subtract 5, then divide by 7: x = 7.

  2. 2. 11 × x + 10 = 131. Find x.

    11

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

  3. 3. 5 × x + 16 = 41. Find x.

    5

    Subtract 16, then divide by 5: x = 5.

  4. 4. 5 × x + 20 = 45. Find x.

    5

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

  5. 5. 11 × x + 5 = 126. Find x.

    11

    Subtract 5, then divide by 11: x = 11.

  6. 6. 8 × x + 3 = 67. Find x.

    8

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

  7. 7. 12 × x + 8 = 152. Find x.

    12

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

  8. 8. 10 × x + 18 = 118. Find x.

    10

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

  9. 9. 6 × x + 8 = 44. Find x.

    6

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

  10. 10. 10 × x + 9 = 109. Find x.

    10

    Subtract 9, then divide by 10: x = 10.

  11. 11. 7 × x + 7 = 56. Find x.

    7

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

  12. 12. 2 × x + 15 = 19. Find x.

    2

    Subtract 15, then divide by 2: x = 2.

12 questions · Seed 57 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 7 × x + 5 = 54. Find x.

    LHS=RHS
    7 · 5 · 54 · Missing-value equations

  2. 2. 11 × x + 10 = 131. Find x.

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

  3. 3. 5 × x + 16 = 41. Find x.

    LHS=RHS
    5 · 16 · 41 · Missing-value equations

  4. 4. 5 × x + 20 = 45. Find x.

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

  5. 5. 11 × x + 5 = 126. Find x.

    LHS=RHS
    11 · 5 · 126 · Missing-value equations

  6. 6. 8 × x + 3 = 67. Find x.

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

  7. 7. 12 × x + 8 = 152. Find x.

    LHS=RHS
    12 · 8 · 152 · Missing-value equations

  8. 8. 10 × x + 18 = 118. Find x.

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

  9. 9. 6 × x + 8 = 44. Find x.

    LHS=RHS
    6 · 8 · 44 · Missing-value equations

  10. 10. 10 × x + 9 = 109. Find x.

    LHS=RHS
    10 · 9 · 109 · Missing-value equations

  11. 11. 7 × x + 7 = 56. Find x.

    LHS=RHS
    7 · 7 · 56 · Missing-value equations

  12. 12. 2 × x + 15 = 19. Find x.

    LHS=RHS
    2 · 15 · 19 · Missing-value equations
12 questions · Seed 57 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 7 × x + 5 = 54. Find x.

    7

    Subtract 5, then divide by 7: x = 7.

  2. 2. 11 × x + 10 = 131. Find x.

    11

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

  3. 3. 5 × x + 16 = 41. Find x.

    5

    Subtract 16, then divide by 5: x = 5.

  4. 4. 5 × x + 20 = 45. Find x.

    5

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

  5. 5. 11 × x + 5 = 126. Find x.

    11

    Subtract 5, then divide by 11: x = 11.

  6. 6. 8 × x + 3 = 67. Find x.

    8

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

  7. 7. 12 × x + 8 = 152. Find x.

    12

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

  8. 8. 10 × x + 18 = 118. Find x.

    10

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

  9. 9. 6 × x + 8 = 44. Find x.

    6

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

  10. 10. 10 × x + 9 = 109. Find x.

    10

    Subtract 9, then divide by 10: x = 10.

  11. 11. 7 × x + 7 = 56. Find x.

    7

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

  12. 12. 2 × x + 15 = 19. Find x.

    2

    Subtract 15, then divide by 2: x = 2.

12 questions · Seed 57 · Age guidance, not curriculum certification