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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. 8 × x + 11 = 75. Find x.

    LHS=RHS
    8 · 11 · 75 · Missing-value equations

  2. 2. 5 × x + 17 = 42. Find x.

    LHS=RHS
    5 · 17 · 42 · Missing-value equations

  3. 3. 9 × x + 20 = 101. Find x.

    LHS=RHS
    9 · 20 · 101 · Missing-value equations

  4. 4. 7 × x + 4 = 53. Find x.

    LHS=RHS
    7 · 4 · 53 · Missing-value equations

  5. 5. 5 × x + 15 = 40. Find x.

    LHS=RHS
    5 · 15 · 40 · Missing-value equations

  6. 6. 4 × x + 5 = 21. Find x.

    LHS=RHS
    4 · 5 · 21 · Missing-value equations

  7. 7. 10 × x + 14 = 114. Find x.

    LHS=RHS
    10 · 14 · 114 · Missing-value equations

  8. 8. 11 × x + 6 = 127. Find x.

    LHS=RHS
    11 · 6 · 127 · Missing-value equations

  9. 9. 12 × x + 3 = 147. Find x.

    LHS=RHS
    12 · 3 · 147 · Missing-value equations

  10. 10. 4 × x + 17 = 33. Find x.

    LHS=RHS
    4 · 17 · 33 · Missing-value equations

  11. 11. 11 × x + 9 = 130. Find x.

    LHS=RHS
    11 · 9 · 130 · Missing-value equations

  12. 12. 5 × x + 5 = 30. Find x.

    LHS=RHS
    5 · 5 · 30 · Missing-value equations
12 questions · Seed 104737 · 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. 8 × x + 11 = 75. Find x.

    8

    Subtract 11, then divide by 8: x = 8.

  2. 2. 5 × x + 17 = 42. Find x.

    5

    Subtract 17, then divide by 5: x = 5.

  3. 3. 9 × x + 20 = 101. Find x.

    9

    Subtract 20, then divide by 9: x = 9.

  4. 4. 7 × x + 4 = 53. Find x.

    7

    Subtract 4, then divide by 7: x = 7.

  5. 5. 5 × x + 15 = 40. Find x.

    5

    Subtract 15, then divide by 5: x = 5.

  6. 6. 4 × x + 5 = 21. Find x.

    4

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

  7. 7. 10 × x + 14 = 114. Find x.

    10

    Subtract 14, then divide by 10: x = 10.

  8. 8. 11 × x + 6 = 127. Find x.

    11

    Subtract 6, then divide by 11: x = 11.

  9. 9. 12 × x + 3 = 147. Find x.

    12

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

  10. 10. 4 × x + 17 = 33. Find x.

    4

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

  11. 11. 11 × x + 9 = 130. Find x.

    11

    Subtract 9, then divide by 11: x = 11.

  12. 12. 5 × x + 5 = 30. Find x.

    5

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

12 questions · Seed 104737 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 8 × x + 11 = 75. Find x.

    LHS=RHS
    8 · 11 · 75 · Missing-value equations

  2. 2. 5 × x + 17 = 42. Find x.

    LHS=RHS
    5 · 17 · 42 · Missing-value equations

  3. 3. 9 × x + 20 = 101. Find x.

    LHS=RHS
    9 · 20 · 101 · Missing-value equations

  4. 4. 7 × x + 4 = 53. Find x.

    LHS=RHS
    7 · 4 · 53 · Missing-value equations

  5. 5. 5 × x + 15 = 40. Find x.

    LHS=RHS
    5 · 15 · 40 · Missing-value equations

  6. 6. 4 × x + 5 = 21. Find x.

    LHS=RHS
    4 · 5 · 21 · Missing-value equations

  7. 7. 10 × x + 14 = 114. Find x.

    LHS=RHS
    10 · 14 · 114 · Missing-value equations

  8. 8. 11 × x + 6 = 127. Find x.

    LHS=RHS
    11 · 6 · 127 · Missing-value equations

  9. 9. 12 × x + 3 = 147. Find x.

    LHS=RHS
    12 · 3 · 147 · Missing-value equations

  10. 10. 4 × x + 17 = 33. Find x.

    LHS=RHS
    4 · 17 · 33 · Missing-value equations

  11. 11. 11 × x + 9 = 130. Find x.

    LHS=RHS
    11 · 9 · 130 · Missing-value equations

  12. 12. 5 × x + 5 = 30. Find x.

    LHS=RHS
    5 · 5 · 30 · Missing-value equations
12 questions · Seed 104737 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 8 × x + 11 = 75. Find x.

    8

    Subtract 11, then divide by 8: x = 8.

  2. 2. 5 × x + 17 = 42. Find x.

    5

    Subtract 17, then divide by 5: x = 5.

  3. 3. 9 × x + 20 = 101. Find x.

    9

    Subtract 20, then divide by 9: x = 9.

  4. 4. 7 × x + 4 = 53. Find x.

    7

    Subtract 4, then divide by 7: x = 7.

  5. 5. 5 × x + 15 = 40. Find x.

    5

    Subtract 15, then divide by 5: x = 5.

  6. 6. 4 × x + 5 = 21. Find x.

    4

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

  7. 7. 10 × x + 14 = 114. Find x.

    10

    Subtract 14, then divide by 10: x = 10.

  8. 8. 11 × x + 6 = 127. Find x.

    11

    Subtract 6, then divide by 11: x = 11.

  9. 9. 12 × x + 3 = 147. Find x.

    12

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

  10. 10. 4 × x + 17 = 33. Find x.

    4

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

  11. 11. 11 × x + 9 = 130. Find x.

    11

    Subtract 9, then divide by 11: x = 11.

  12. 12. 5 × x + 5 = 30. Find x.

    5

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

12 questions · Seed 104737 · Age guidance, not curriculum certification