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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 + 4 = 85. Find x.

    LHS=RHS
    9 · 4 · 85 · Missing-value equations

  2. 2. 4 × x + 11 = 27. Find x.

    LHS=RHS
    4 · 11 · 27 · Missing-value equations

  3. 3. 10 × x + 6 = 106. Find x.

    LHS=RHS
    10 · 6 · 106 · Missing-value equations

  4. 4. 3 × x + 8 = 17. Find x.

    LHS=RHS
    3 · 8 · 17 · Missing-value equations

  5. 5. 9 × x + 14 = 95. Find x.

    LHS=RHS
    9 · 14 · 95 · Missing-value equations

  6. 6. 6 × x + 20 = 56. Find x.

    LHS=RHS
    6 · 20 · 56 · Missing-value equations

  7. 7. 12 × x + 10 = 154. Find x.

    LHS=RHS
    12 · 10 · 154 · Missing-value equations

  8. 8. 8 × x + 18 = 82. Find x.

    LHS=RHS
    8 · 18 · 82 · Missing-value equations

  9. 9. 9 × x + 12 = 93. Find x.

    LHS=RHS
    9 · 12 · 93 · Missing-value equations

  10. 10. 2 × x + 12 = 16. Find x.

    LHS=RHS
    2 · 12 · 16 · Missing-value equations

  11. 11. 5 × x + 17 = 42. Find x.

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

  12. 12. 2 × x + 13 = 17. Find x.

    LHS=RHS
    2 · 13 · 17 · Missing-value equations
12 questions · Seed 104741 · 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 + 4 = 85. Find x.

    9

    Subtract 4, then divide by 9: x = 9.

  2. 2. 4 × x + 11 = 27. Find x.

    4

    Subtract 11, then divide by 4: x = 4.

  3. 3. 10 × x + 6 = 106. Find x.

    10

    Subtract 6, then divide by 10: x = 10.

  4. 4. 3 × x + 8 = 17. Find x.

    3

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

  5. 5. 9 × x + 14 = 95. Find x.

    9

    Subtract 14, then divide by 9: x = 9.

  6. 6. 6 × x + 20 = 56. Find x.

    6

    Subtract 20, then divide by 6: x = 6.

  7. 7. 12 × x + 10 = 154. Find x.

    12

    Subtract 10, then divide by 12: x = 12.

  8. 8. 8 × x + 18 = 82. Find x.

    8

    Subtract 18, then divide by 8: x = 8.

  9. 9. 9 × x + 12 = 93. Find x.

    9

    Subtract 12, then divide by 9: x = 9.

  10. 10. 2 × x + 12 = 16. Find x.

    2

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

  11. 11. 5 × x + 17 = 42. Find x.

    5

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

  12. 12. 2 × x + 13 = 17. Find x.

    2

    Subtract 13, then divide by 2: x = 2.

12 questions · Seed 104741 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 9 × x + 4 = 85. Find x.

    LHS=RHS
    9 · 4 · 85 · Missing-value equations

  2. 2. 4 × x + 11 = 27. Find x.

    LHS=RHS
    4 · 11 · 27 · Missing-value equations

  3. 3. 10 × x + 6 = 106. Find x.

    LHS=RHS
    10 · 6 · 106 · Missing-value equations

  4. 4. 3 × x + 8 = 17. Find x.

    LHS=RHS
    3 · 8 · 17 · Missing-value equations

  5. 5. 9 × x + 14 = 95. Find x.

    LHS=RHS
    9 · 14 · 95 · Missing-value equations

  6. 6. 6 × x + 20 = 56. Find x.

    LHS=RHS
    6 · 20 · 56 · Missing-value equations

  7. 7. 12 × x + 10 = 154. Find x.

    LHS=RHS
    12 · 10 · 154 · Missing-value equations

  8. 8. 8 × x + 18 = 82. Find x.

    LHS=RHS
    8 · 18 · 82 · Missing-value equations

  9. 9. 9 × x + 12 = 93. Find x.

    LHS=RHS
    9 · 12 · 93 · Missing-value equations

  10. 10. 2 × x + 12 = 16. Find x.

    LHS=RHS
    2 · 12 · 16 · Missing-value equations

  11. 11. 5 × x + 17 = 42. Find x.

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

  12. 12. 2 × x + 13 = 17. Find x.

    LHS=RHS
    2 · 13 · 17 · Missing-value equations
12 questions · Seed 104741 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 9 × x + 4 = 85. Find x.

    9

    Subtract 4, then divide by 9: x = 9.

  2. 2. 4 × x + 11 = 27. Find x.

    4

    Subtract 11, then divide by 4: x = 4.

  3. 3. 10 × x + 6 = 106. Find x.

    10

    Subtract 6, then divide by 10: x = 10.

  4. 4. 3 × x + 8 = 17. Find x.

    3

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

  5. 5. 9 × x + 14 = 95. Find x.

    9

    Subtract 14, then divide by 9: x = 9.

  6. 6. 6 × x + 20 = 56. Find x.

    6

    Subtract 20, then divide by 6: x = 6.

  7. 7. 12 × x + 10 = 154. Find x.

    12

    Subtract 10, then divide by 12: x = 12.

  8. 8. 8 × x + 18 = 82. Find x.

    8

    Subtract 18, then divide by 8: x = 8.

  9. 9. 9 × x + 12 = 93. Find x.

    9

    Subtract 12, then divide by 9: x = 9.

  10. 10. 2 × x + 12 = 16. Find x.

    2

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

  11. 11. 5 × x + 17 = 42. Find x.

    5

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

  12. 12. 2 × x + 13 = 17. Find x.

    2

    Subtract 13, then divide by 2: x = 2.

12 questions · Seed 104741 · Age guidance, not curriculum certification