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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. 10 × x + 2 = 102. Find x.

    LHS=RHS
    10 · 2 · 102 · Missing-value equations

  2. 2. 10 × x + 20 = 120. Find x.

    LHS=RHS
    10 · 20 · 120 · Missing-value equations

  3. 3. 3 × x + 3 = 12. Find x.

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

  4. 4. 8 × x + 7 = 71. Find x.

    LHS=RHS
    8 · 7 · 71 · Missing-value equations

  5. 5. 9 × x + 16 = 97. Find x.

    LHS=RHS
    9 · 16 · 97 · Missing-value equations

  6. 6. 11 × x + 3 = 124. Find x.

    LHS=RHS
    11 · 3 · 124 · Missing-value equations

  7. 7. 3 × x + 18 = 27. Find x.

    LHS=RHS
    3 · 18 · 27 · Missing-value equations

  8. 8. 7 × x + 2 = 51. Find x.

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

  9. 9. 2 × x + 16 = 20. Find x.

    LHS=RHS
    2 · 16 · 20 · Missing-value equations

  10. 10. 10 × x + 16 = 116. Find x.

    LHS=RHS
    10 · 16 · 116 · Missing-value equations

  11. 11. 12 × x + 2 = 146. Find x.

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

  12. 12. 9 × x + 3 = 84. Find x.

    LHS=RHS
    9 · 3 · 84 · Missing-value equations
12 questions · Seed 54 · 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. 10 × x + 2 = 102. Find x.

    10

    Subtract 2, then divide by 10: x = 10.

  2. 2. 10 × x + 20 = 120. Find x.

    10

    Subtract 20, then divide by 10: x = 10.

  3. 3. 3 × x + 3 = 12. Find x.

    3

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

  4. 4. 8 × x + 7 = 71. Find x.

    8

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

  5. 5. 9 × x + 16 = 97. Find x.

    9

    Subtract 16, then divide by 9: x = 9.

  6. 6. 11 × x + 3 = 124. Find x.

    11

    Subtract 3, then divide by 11: x = 11.

  7. 7. 3 × x + 18 = 27. Find x.

    3

    Subtract 18, then divide by 3: x = 3.

  8. 8. 7 × x + 2 = 51. Find x.

    7

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

  9. 9. 2 × x + 16 = 20. Find x.

    2

    Subtract 16, then divide by 2: x = 2.

  10. 10. 10 × x + 16 = 116. Find x.

    10

    Subtract 16, then divide by 10: x = 10.

  11. 11. 12 × x + 2 = 146. Find x.

    12

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

  12. 12. 9 × x + 3 = 84. Find x.

    9

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

12 questions · Seed 54 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 10 × x + 2 = 102. Find x.

    LHS=RHS
    10 · 2 · 102 · Missing-value equations

  2. 2. 10 × x + 20 = 120. Find x.

    LHS=RHS
    10 · 20 · 120 · Missing-value equations

  3. 3. 3 × x + 3 = 12. Find x.

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

  4. 4. 8 × x + 7 = 71. Find x.

    LHS=RHS
    8 · 7 · 71 · Missing-value equations

  5. 5. 9 × x + 16 = 97. Find x.

    LHS=RHS
    9 · 16 · 97 · Missing-value equations

  6. 6. 11 × x + 3 = 124. Find x.

    LHS=RHS
    11 · 3 · 124 · Missing-value equations

  7. 7. 3 × x + 18 = 27. Find x.

    LHS=RHS
    3 · 18 · 27 · Missing-value equations

  8. 8. 7 × x + 2 = 51. Find x.

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

  9. 9. 2 × x + 16 = 20. Find x.

    LHS=RHS
    2 · 16 · 20 · Missing-value equations

  10. 10. 10 × x + 16 = 116. Find x.

    LHS=RHS
    10 · 16 · 116 · Missing-value equations

  11. 11. 12 × x + 2 = 146. Find x.

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

  12. 12. 9 × x + 3 = 84. Find x.

    LHS=RHS
    9 · 3 · 84 · Missing-value equations
12 questions · Seed 54 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 10 × x + 2 = 102. Find x.

    10

    Subtract 2, then divide by 10: x = 10.

  2. 2. 10 × x + 20 = 120. Find x.

    10

    Subtract 20, then divide by 10: x = 10.

  3. 3. 3 × x + 3 = 12. Find x.

    3

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

  4. 4. 8 × x + 7 = 71. Find x.

    8

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

  5. 5. 9 × x + 16 = 97. Find x.

    9

    Subtract 16, then divide by 9: x = 9.

  6. 6. 11 × x + 3 = 124. Find x.

    11

    Subtract 3, then divide by 11: x = 11.

  7. 7. 3 × x + 18 = 27. Find x.

    3

    Subtract 18, then divide by 3: x = 3.

  8. 8. 7 × x + 2 = 51. Find x.

    7

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

  9. 9. 2 × x + 16 = 20. Find x.

    2

    Subtract 16, then divide by 2: x = 2.

  10. 10. 10 × x + 16 = 116. Find x.

    10

    Subtract 16, then divide by 10: x = 10.

  11. 11. 12 × x + 2 = 146. Find x.

    12

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

  12. 12. 9 × x + 3 = 84. Find x.

    9

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

12 questions · Seed 54 · Age guidance, not curriculum certification