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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. 8 × x + 9 = 73. Find x.

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

  2. 2. 6 × x + 8 = 44. Find x.

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

  3. 3. 7 × x + 8 = 57. Find x.

    LHS=RHS
    7 · 8 · 57 · Missing-value equations

  4. 4. 4 × x + 12 = 28. Find x.

    LHS=RHS
    4 · 12 · 28 · Missing-value equations

  5. 5. 4 × x + 18 = 34. Find x.

    LHS=RHS
    4 · 18 · 34 · Missing-value equations

  6. 6. 10 × x + 14 = 114. Find x.

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

  7. 7. 2 × x + 5 = 9. Find x.

    LHS=RHS
    2 · 5 · 9 · Missing-value equations

  8. 8. 5 × x + 19 = 44. Find x.

    LHS=RHS
    5 · 19 · 44 · Missing-value equations

  9. 9. 11 × x + 2 = 123. Find x.

    LHS=RHS
    11 · 2 · 123 · Missing-value equations

  10. 10. 4 × x + 16 = 32. Find x.

    LHS=RHS
    4 · 16 · 32 · Missing-value equations

  11. 11. 3 × x + 4 = 13. Find x.

    LHS=RHS
    3 · 4 · 13 · Missing-value equations

  12. 12. 10 × x + 2 = 102. Find x.

    LHS=RHS
    10 · 2 · 102 · Missing-value equations
12 questions · Seed 104735 · 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. 8 × x + 9 = 73. Find x.

    8

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

  2. 2. 6 × x + 8 = 44. Find x.

    6

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

  3. 3. 7 × x + 8 = 57. Find x.

    7

    Subtract 8, then divide by 7: x = 7.

  4. 4. 4 × x + 12 = 28. Find x.

    4

    Subtract 12, then divide by 4: x = 4.

  5. 5. 4 × x + 18 = 34. Find x.

    4

    Subtract 18, then divide by 4: x = 4.

  6. 6. 10 × x + 14 = 114. Find x.

    10

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

  7. 7. 2 × x + 5 = 9. Find x.

    2

    Subtract 5, then divide by 2: x = 2.

  8. 8. 5 × x + 19 = 44. Find x.

    5

    Subtract 19, then divide by 5: x = 5.

  9. 9. 11 × x + 2 = 123. Find x.

    11

    Subtract 2, then divide by 11: x = 11.

  10. 10. 4 × x + 16 = 32. Find x.

    4

    Subtract 16, then divide by 4: x = 4.

  11. 11. 3 × x + 4 = 13. Find x.

    3

    Subtract 4, then divide by 3: x = 3.

  12. 12. 10 × x + 2 = 102. Find x.

    10

    Subtract 2, then divide by 10: x = 10.

12 questions · Seed 104735 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 8 × x + 9 = 73. Find x.

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

  2. 2. 6 × x + 8 = 44. Find x.

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

  3. 3. 7 × x + 8 = 57. Find x.

    LHS=RHS
    7 · 8 · 57 · Missing-value equations

  4. 4. 4 × x + 12 = 28. Find x.

    LHS=RHS
    4 · 12 · 28 · Missing-value equations

  5. 5. 4 × x + 18 = 34. Find x.

    LHS=RHS
    4 · 18 · 34 · Missing-value equations

  6. 6. 10 × x + 14 = 114. Find x.

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

  7. 7. 2 × x + 5 = 9. Find x.

    LHS=RHS
    2 · 5 · 9 · Missing-value equations

  8. 8. 5 × x + 19 = 44. Find x.

    LHS=RHS
    5 · 19 · 44 · Missing-value equations

  9. 9. 11 × x + 2 = 123. Find x.

    LHS=RHS
    11 · 2 · 123 · Missing-value equations

  10. 10. 4 × x + 16 = 32. Find x.

    LHS=RHS
    4 · 16 · 32 · Missing-value equations

  11. 11. 3 × x + 4 = 13. Find x.

    LHS=RHS
    3 · 4 · 13 · Missing-value equations

  12. 12. 10 × x + 2 = 102. Find x.

    LHS=RHS
    10 · 2 · 102 · Missing-value equations
12 questions · Seed 104735 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 8 × x + 9 = 73. Find x.

    8

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

  2. 2. 6 × x + 8 = 44. Find x.

    6

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

  3. 3. 7 × x + 8 = 57. Find x.

    7

    Subtract 8, then divide by 7: x = 7.

  4. 4. 4 × x + 12 = 28. Find x.

    4

    Subtract 12, then divide by 4: x = 4.

  5. 5. 4 × x + 18 = 34. Find x.

    4

    Subtract 18, then divide by 4: x = 4.

  6. 6. 10 × x + 14 = 114. Find x.

    10

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

  7. 7. 2 × x + 5 = 9. Find x.

    2

    Subtract 5, then divide by 2: x = 2.

  8. 8. 5 × x + 19 = 44. Find x.

    5

    Subtract 19, then divide by 5: x = 5.

  9. 9. 11 × x + 2 = 123. Find x.

    11

    Subtract 2, then divide by 11: x = 11.

  10. 10. 4 × x + 16 = 32. Find x.

    4

    Subtract 16, then divide by 4: x = 4.

  11. 11. 3 × x + 4 = 13. Find x.

    3

    Subtract 4, then divide by 3: x = 3.

  12. 12. 10 × x + 2 = 102. Find x.

    10

    Subtract 2, then divide by 10: x = 10.

12 questions · Seed 104735 · Age guidance, not curriculum certification