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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. 12 × x + 6 = 150. Find x.

    LHS=RHS
    12 · 6 · 150 · Missing-value equations

  2. 2. 9 × x + 14 = 95. Find x.

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

  3. 3. 12 × x + 18 = 162. Find x.

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

  4. 4. 7 × x + 18 = 67. Find x.

    LHS=RHS
    7 · 18 · 67 · Missing-value equations

  5. 5. 11 × x + 19 = 140. Find x.

    LHS=RHS
    11 · 19 · 140 · Missing-value equations

  6. 6. 11 × x + 7 = 128. Find x.

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

  7. 7. 5 × x + 20 = 45. Find x.

    LHS=RHS
    5 · 20 · 45 · Missing-value equations

  8. 8. 5 × x + 7 = 32. Find x.

    LHS=RHS
    5 · 7 · 32 · Missing-value equations

  9. 9. 4 × x + 11 = 27. Find x.

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

  10. 10. 7 × x + 3 = 52. Find x.

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

  11. 11. 2 × x + 17 = 21. Find x.

    LHS=RHS
    2 · 17 · 21 · Missing-value equations

  12. 12. 6 × x + 9 = 45. Find x.

    LHS=RHS
    6 · 9 · 45 · Missing-value equations
12 questions · Seed 53 · 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. 12 × x + 6 = 150. Find x.

    12

    Subtract 6, then divide by 12: x = 12.

  2. 2. 9 × x + 14 = 95. Find x.

    9

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

  3. 3. 12 × x + 18 = 162. Find x.

    12

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

  4. 4. 7 × x + 18 = 67. Find x.

    7

    Subtract 18, then divide by 7: x = 7.

  5. 5. 11 × x + 19 = 140. Find x.

    11

    Subtract 19, then divide by 11: x = 11.

  6. 6. 11 × x + 7 = 128. Find x.

    11

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

  7. 7. 5 × x + 20 = 45. Find x.

    5

    Subtract 20, then divide by 5: x = 5.

  8. 8. 5 × x + 7 = 32. Find x.

    5

    Subtract 7, then divide by 5: x = 5.

  9. 9. 4 × x + 11 = 27. Find x.

    4

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

  10. 10. 7 × x + 3 = 52. Find x.

    7

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

  11. 11. 2 × x + 17 = 21. Find x.

    2

    Subtract 17, then divide by 2: x = 2.

  12. 12. 6 × x + 9 = 45. Find x.

    6

    Subtract 9, then divide by 6: x = 6.

12 questions · Seed 53 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 12 × x + 6 = 150. Find x.

    LHS=RHS
    12 · 6 · 150 · Missing-value equations

  2. 2. 9 × x + 14 = 95. Find x.

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

  3. 3. 12 × x + 18 = 162. Find x.

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

  4. 4. 7 × x + 18 = 67. Find x.

    LHS=RHS
    7 · 18 · 67 · Missing-value equations

  5. 5. 11 × x + 19 = 140. Find x.

    LHS=RHS
    11 · 19 · 140 · Missing-value equations

  6. 6. 11 × x + 7 = 128. Find x.

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

  7. 7. 5 × x + 20 = 45. Find x.

    LHS=RHS
    5 · 20 · 45 · Missing-value equations

  8. 8. 5 × x + 7 = 32. Find x.

    LHS=RHS
    5 · 7 · 32 · Missing-value equations

  9. 9. 4 × x + 11 = 27. Find x.

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

  10. 10. 7 × x + 3 = 52. Find x.

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

  11. 11. 2 × x + 17 = 21. Find x.

    LHS=RHS
    2 · 17 · 21 · Missing-value equations

  12. 12. 6 × x + 9 = 45. Find x.

    LHS=RHS
    6 · 9 · 45 · Missing-value equations
12 questions · Seed 53 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 12 × x + 6 = 150. Find x.

    12

    Subtract 6, then divide by 12: x = 12.

  2. 2. 9 × x + 14 = 95. Find x.

    9

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

  3. 3. 12 × x + 18 = 162. Find x.

    12

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

  4. 4. 7 × x + 18 = 67. Find x.

    7

    Subtract 18, then divide by 7: x = 7.

  5. 5. 11 × x + 19 = 140. Find x.

    11

    Subtract 19, then divide by 11: x = 11.

  6. 6. 11 × x + 7 = 128. Find x.

    11

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

  7. 7. 5 × x + 20 = 45. Find x.

    5

    Subtract 20, then divide by 5: x = 5.

  8. 8. 5 × x + 7 = 32. Find x.

    5

    Subtract 7, then divide by 5: x = 5.

  9. 9. 4 × x + 11 = 27. Find x.

    4

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

  10. 10. 7 × x + 3 = 52. Find x.

    7

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

  11. 11. 2 × x + 17 = 21. Find x.

    2

    Subtract 17, then divide by 2: x = 2.

  12. 12. 6 × x + 9 = 45. Find x.

    6

    Subtract 9, then divide by 6: x = 6.

12 questions · Seed 53 · Age guidance, not curriculum certification