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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 + 7 = 107. Find x.

    LHS=RHS
    10 · 7 · 107 · Missing-value equations

  2. 2. 11 × x + 9 = 130. Find x.

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

  3. 3. 12 × x + 15 = 159. Find x.

    LHS=RHS
    12 · 15 · 159 · Missing-value equations

  4. 4. 2 × x + 3 = 7. Find x.

    LHS=RHS
    2 · 3 · 7 · Missing-value equations

  5. 5. 11 × x + 7 = 128. Find x.

    LHS=RHS
    11 · 7 · 128 · Missing-value equations

  6. 6. 2 × x + 4 = 8. Find x.

    LHS=RHS
    2 · 4 · 8 · Missing-value equations

  7. 7. 7 × x + 14 = 63. Find x.

    LHS=RHS
    7 · 14 · 63 · Missing-value equations

  8. 8. 12 × x + 14 = 158. Find x.

    LHS=RHS
    12 · 14 · 158 · Missing-value equations

  9. 9. 12 × x + 11 = 155. Find x.

    LHS=RHS
    12 · 11 · 155 · Missing-value equations

  10. 10. 7 × x + 15 = 64. Find x.

    LHS=RHS
    7 · 15 · 64 · Missing-value equations

  11. 11. 9 × x + 17 = 98. Find x.

    LHS=RHS
    9 · 17 · 98 · Missing-value equations

  12. 12. 8 × x + 2 = 66. Find x.

    LHS=RHS
    8 · 2 · 66 · Missing-value equations
12 questions · Seed 104736 · 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 + 7 = 107. Find x.

    10

    Subtract 7, then divide by 10: x = 10.

  2. 2. 11 × x + 9 = 130. Find x.

    11

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

  3. 3. 12 × x + 15 = 159. Find x.

    12

    Subtract 15, then divide by 12: x = 12.

  4. 4. 2 × x + 3 = 7. Find x.

    2

    Subtract 3, then divide by 2: x = 2.

  5. 5. 11 × x + 7 = 128. Find x.

    11

    Subtract 7, then divide by 11: x = 11.

  6. 6. 2 × x + 4 = 8. Find x.

    2

    Subtract 4, then divide by 2: x = 2.

  7. 7. 7 × x + 14 = 63. Find x.

    7

    Subtract 14, then divide by 7: x = 7.

  8. 8. 12 × x + 14 = 158. Find x.

    12

    Subtract 14, then divide by 12: x = 12.

  9. 9. 12 × x + 11 = 155. Find x.

    12

    Subtract 11, then divide by 12: x = 12.

  10. 10. 7 × x + 15 = 64. Find x.

    7

    Subtract 15, then divide by 7: x = 7.

  11. 11. 9 × x + 17 = 98. Find x.

    9

    Subtract 17, then divide by 9: x = 9.

  12. 12. 8 × x + 2 = 66. Find x.

    8

    Subtract 2, then divide by 8: x = 8.

12 questions · Seed 104736 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 10 × x + 7 = 107. Find x.

    LHS=RHS
    10 · 7 · 107 · Missing-value equations

  2. 2. 11 × x + 9 = 130. Find x.

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

  3. 3. 12 × x + 15 = 159. Find x.

    LHS=RHS
    12 · 15 · 159 · Missing-value equations

  4. 4. 2 × x + 3 = 7. Find x.

    LHS=RHS
    2 · 3 · 7 · Missing-value equations

  5. 5. 11 × x + 7 = 128. Find x.

    LHS=RHS
    11 · 7 · 128 · Missing-value equations

  6. 6. 2 × x + 4 = 8. Find x.

    LHS=RHS
    2 · 4 · 8 · Missing-value equations

  7. 7. 7 × x + 14 = 63. Find x.

    LHS=RHS
    7 · 14 · 63 · Missing-value equations

  8. 8. 12 × x + 14 = 158. Find x.

    LHS=RHS
    12 · 14 · 158 · Missing-value equations

  9. 9. 12 × x + 11 = 155. Find x.

    LHS=RHS
    12 · 11 · 155 · Missing-value equations

  10. 10. 7 × x + 15 = 64. Find x.

    LHS=RHS
    7 · 15 · 64 · Missing-value equations

  11. 11. 9 × x + 17 = 98. Find x.

    LHS=RHS
    9 · 17 · 98 · Missing-value equations

  12. 12. 8 × x + 2 = 66. Find x.

    LHS=RHS
    8 · 2 · 66 · Missing-value equations
12 questions · Seed 104736 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 10 × x + 7 = 107. Find x.

    10

    Subtract 7, then divide by 10: x = 10.

  2. 2. 11 × x + 9 = 130. Find x.

    11

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

  3. 3. 12 × x + 15 = 159. Find x.

    12

    Subtract 15, then divide by 12: x = 12.

  4. 4. 2 × x + 3 = 7. Find x.

    2

    Subtract 3, then divide by 2: x = 2.

  5. 5. 11 × x + 7 = 128. Find x.

    11

    Subtract 7, then divide by 11: x = 11.

  6. 6. 2 × x + 4 = 8. Find x.

    2

    Subtract 4, then divide by 2: x = 2.

  7. 7. 7 × x + 14 = 63. Find x.

    7

    Subtract 14, then divide by 7: x = 7.

  8. 8. 12 × x + 14 = 158. Find x.

    12

    Subtract 14, then divide by 12: x = 12.

  9. 9. 12 × x + 11 = 155. Find x.

    12

    Subtract 11, then divide by 12: x = 12.

  10. 10. 7 × x + 15 = 64. Find x.

    7

    Subtract 15, then divide by 7: x = 7.

  11. 11. 9 × x + 17 = 98. Find x.

    9

    Subtract 17, then divide by 9: x = 9.

  12. 12. 8 × x + 2 = 66. Find x.

    8

    Subtract 2, then divide by 8: x = 8.

12 questions · Seed 104736 · Age guidance, not curriculum certification