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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 + 3 = 52. Find x.

    LHS=RHS
    7 · 3 · 52 · Missing-value equations

  2. 2. 12 × x + 18 = 162. Find x.

    LHS=RHS
    12 · 18 · 162 · Missing-value equations

  3. 3. 6 × x + 16 = 52. Find x.

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

  4. 4. 12 × x + 5 = 149. Find x.

    LHS=RHS
    12 · 5 · 149 · Missing-value equations

  5. 5. 2 × x + 18 = 22. Find x.

    LHS=RHS
    2 · 18 · 22 · Missing-value equations

  6. 6. 10 × x + 3 = 103. Find x.

    LHS=RHS
    10 · 3 · 103 · Missing-value equations

  7. 7. 8 × x + 9 = 73. Find x.

    LHS=RHS
    8 · 9 · 73 · Missing-value equations

  8. 8. 9 × x + 15 = 96. Find x.

    LHS=RHS
    9 · 15 · 96 · Missing-value equations

  9. 9. 10 × x + 14 = 114. Find x.

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

  10. 10. 6 × x + 11 = 47. Find x.

    LHS=RHS
    6 · 11 · 47 · Missing-value equations

  11. 11. 4 × x + 9 = 25. Find x.

    LHS=RHS
    4 · 9 · 25 · Missing-value equations

  12. 12. 9 × x + 9 = 90. Find x.

    LHS=RHS
    9 · 9 · 90 · Missing-value equations
12 questions · Seed 42 · 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 + 3 = 52. Find x.

    7

    Subtract 3, then divide by 7: x = 7.

  2. 2. 12 × x + 18 = 162. Find x.

    12

    Subtract 18, then divide by 12: x = 12.

  3. 3. 6 × x + 16 = 52. Find x.

    6

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

  4. 4. 12 × x + 5 = 149. Find x.

    12

    Subtract 5, then divide by 12: x = 12.

  5. 5. 2 × x + 18 = 22. Find x.

    2

    Subtract 18, then divide by 2: x = 2.

  6. 6. 10 × x + 3 = 103. Find x.

    10

    Subtract 3, then divide by 10: x = 10.

  7. 7. 8 × x + 9 = 73. Find x.

    8

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

  8. 8. 9 × x + 15 = 96. Find x.

    9

    Subtract 15, then divide by 9: x = 9.

  9. 9. 10 × x + 14 = 114. Find x.

    10

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

  10. 10. 6 × x + 11 = 47. Find x.

    6

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

  11. 11. 4 × x + 9 = 25. Find x.

    4

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

  12. 12. 9 × x + 9 = 90. Find x.

    9

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

12 questions · Seed 42 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 7 × x + 3 = 52. Find x.

    LHS=RHS
    7 · 3 · 52 · Missing-value equations

  2. 2. 12 × x + 18 = 162. Find x.

    LHS=RHS
    12 · 18 · 162 · Missing-value equations

  3. 3. 6 × x + 16 = 52. Find x.

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

  4. 4. 12 × x + 5 = 149. Find x.

    LHS=RHS
    12 · 5 · 149 · Missing-value equations

  5. 5. 2 × x + 18 = 22. Find x.

    LHS=RHS
    2 · 18 · 22 · Missing-value equations

  6. 6. 10 × x + 3 = 103. Find x.

    LHS=RHS
    10 · 3 · 103 · Missing-value equations

  7. 7. 8 × x + 9 = 73. Find x.

    LHS=RHS
    8 · 9 · 73 · Missing-value equations

  8. 8. 9 × x + 15 = 96. Find x.

    LHS=RHS
    9 · 15 · 96 · Missing-value equations

  9. 9. 10 × x + 14 = 114. Find x.

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

  10. 10. 6 × x + 11 = 47. Find x.

    LHS=RHS
    6 · 11 · 47 · Missing-value equations

  11. 11. 4 × x + 9 = 25. Find x.

    LHS=RHS
    4 · 9 · 25 · Missing-value equations

  12. 12. 9 × x + 9 = 90. Find x.

    LHS=RHS
    9 · 9 · 90 · Missing-value equations
12 questions · Seed 42 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 7 × x + 3 = 52. Find x.

    7

    Subtract 3, then divide by 7: x = 7.

  2. 2. 12 × x + 18 = 162. Find x.

    12

    Subtract 18, then divide by 12: x = 12.

  3. 3. 6 × x + 16 = 52. Find x.

    6

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

  4. 4. 12 × x + 5 = 149. Find x.

    12

    Subtract 5, then divide by 12: x = 12.

  5. 5. 2 × x + 18 = 22. Find x.

    2

    Subtract 18, then divide by 2: x = 2.

  6. 6. 10 × x + 3 = 103. Find x.

    10

    Subtract 3, then divide by 10: x = 10.

  7. 7. 8 × x + 9 = 73. Find x.

    8

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

  8. 8. 9 × x + 15 = 96. Find x.

    9

    Subtract 15, then divide by 9: x = 9.

  9. 9. 10 × x + 14 = 114. Find x.

    10

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

  10. 10. 6 × x + 11 = 47. Find x.

    6

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

  11. 11. 4 × x + 9 = 25. Find x.

    4

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

  12. 12. 9 × x + 9 = 90. Find x.

    9

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

12 questions · Seed 42 · Age guidance, not curriculum certification