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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 + 2 = 51. Find x.

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

  2. 2. 9 × x + 10 = 91. Find x.

    LHS=RHS
    9 · 10 · 91 · Missing-value equations

  3. 3. 5 × x + 16 = 41. Find x.

    LHS=RHS
    5 · 16 · 41 · Missing-value equations

  4. 4. 6 × x + 8 = 44. Find x.

    LHS=RHS
    6 · 8 · 44 · Missing-value equations

  5. 5. 4 × x + 9 = 25. Find x.

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

  6. 6. 4 × x + 14 = 30. Find x.

    LHS=RHS
    4 · 14 · 30 · Missing-value equations

  7. 7. 6 × x + 15 = 51. Find x.

    LHS=RHS
    6 · 15 · 51 · Missing-value equations

  8. 8. 12 × x + 7 = 151. Find x.

    LHS=RHS
    12 · 7 · 151 · Missing-value equations

  9. 9. 4 × x + 19 = 35. Find x.

    LHS=RHS
    4 · 19 · 35 · Missing-value equations

  10. 10. 4 × x + 2 = 18. Find x.

    LHS=RHS
    4 · 2 · 18 · Missing-value equations

  11. 11. 9 × x + 15 = 96. Find x.

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

  12. 12. 6 × x + 10 = 46. Find x.

    LHS=RHS
    6 · 10 · 46 · Missing-value equations
12 questions · Seed 104729 · 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 + 2 = 51. Find x.

    7

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

  2. 2. 9 × x + 10 = 91. Find x.

    9

    Subtract 10, then divide by 9: x = 9.

  3. 3. 5 × x + 16 = 41. Find x.

    5

    Subtract 16, then divide by 5: x = 5.

  4. 4. 6 × x + 8 = 44. Find x.

    6

    Subtract 8, then divide by 6: x = 6.

  5. 5. 4 × x + 9 = 25. Find x.

    4

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

  6. 6. 4 × x + 14 = 30. Find x.

    4

    Subtract 14, then divide by 4: x = 4.

  7. 7. 6 × x + 15 = 51. Find x.

    6

    Subtract 15, then divide by 6: x = 6.

  8. 8. 12 × x + 7 = 151. Find x.

    12

    Subtract 7, then divide by 12: x = 12.

  9. 9. 4 × x + 19 = 35. Find x.

    4

    Subtract 19, then divide by 4: x = 4.

  10. 10. 4 × x + 2 = 18. Find x.

    4

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

  11. 11. 9 × x + 15 = 96. Find x.

    9

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

  12. 12. 6 × x + 10 = 46. Find x.

    6

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

12 questions · Seed 104729 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 7 × x + 2 = 51. Find x.

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

  2. 2. 9 × x + 10 = 91. Find x.

    LHS=RHS
    9 · 10 · 91 · Missing-value equations

  3. 3. 5 × x + 16 = 41. Find x.

    LHS=RHS
    5 · 16 · 41 · Missing-value equations

  4. 4. 6 × x + 8 = 44. Find x.

    LHS=RHS
    6 · 8 · 44 · Missing-value equations

  5. 5. 4 × x + 9 = 25. Find x.

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

  6. 6. 4 × x + 14 = 30. Find x.

    LHS=RHS
    4 · 14 · 30 · Missing-value equations

  7. 7. 6 × x + 15 = 51. Find x.

    LHS=RHS
    6 · 15 · 51 · Missing-value equations

  8. 8. 12 × x + 7 = 151. Find x.

    LHS=RHS
    12 · 7 · 151 · Missing-value equations

  9. 9. 4 × x + 19 = 35. Find x.

    LHS=RHS
    4 · 19 · 35 · Missing-value equations

  10. 10. 4 × x + 2 = 18. Find x.

    LHS=RHS
    4 · 2 · 18 · Missing-value equations

  11. 11. 9 × x + 15 = 96. Find x.

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

  12. 12. 6 × x + 10 = 46. Find x.

    LHS=RHS
    6 · 10 · 46 · Missing-value equations
12 questions · Seed 104729 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 7 × x + 2 = 51. Find x.

    7

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

  2. 2. 9 × x + 10 = 91. Find x.

    9

    Subtract 10, then divide by 9: x = 9.

  3. 3. 5 × x + 16 = 41. Find x.

    5

    Subtract 16, then divide by 5: x = 5.

  4. 4. 6 × x + 8 = 44. Find x.

    6

    Subtract 8, then divide by 6: x = 6.

  5. 5. 4 × x + 9 = 25. Find x.

    4

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

  6. 6. 4 × x + 14 = 30. Find x.

    4

    Subtract 14, then divide by 4: x = 4.

  7. 7. 6 × x + 15 = 51. Find x.

    6

    Subtract 15, then divide by 6: x = 6.

  8. 8. 12 × x + 7 = 151. Find x.

    12

    Subtract 7, then divide by 12: x = 12.

  9. 9. 4 × x + 19 = 35. Find x.

    4

    Subtract 19, then divide by 4: x = 4.

  10. 10. 4 × x + 2 = 18. Find x.

    4

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

  11. 11. 9 × x + 15 = 96. Find x.

    9

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

  12. 12. 6 × x + 10 = 46. Find x.

    6

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

12 questions · Seed 104729 · Age guidance, not curriculum certification