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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 + 12 = 112. Find x.

    LHS=RHS
    10 · 12 · 112 · Missing-value equations

  2. 2. 10 × x + 14 = 114. Find x.

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

  3. 3. 4 × x + 8 = 24. Find x.

    LHS=RHS
    4 · 8 · 24 · Missing-value equations

  4. 4. 2 × x + 13 = 17. Find x.

    LHS=RHS
    2 · 13 · 17 · Missing-value equations

  5. 5. 3 × x + 14 = 23. Find x.

    LHS=RHS
    3 · 14 · 23 · Missing-value equations

  6. 6. 3 × x + 16 = 25. Find x.

    LHS=RHS
    3 · 16 · 25 · Missing-value equations

  7. 7. 8 × x + 6 = 70. Find x.

    LHS=RHS
    8 · 6 · 70 · Missing-value equations

  8. 8. 6 × x + 15 = 51. Find x.

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

  9. 9. 2 × x + 6 = 10. Find x.

    LHS=RHS
    2 · 6 · 10 · Missing-value equations

  10. 10. 10 × x + 19 = 119. Find x.

    LHS=RHS
    10 · 19 · 119 · Missing-value equations

  11. 11. 7 × x + 20 = 69. Find x.

    LHS=RHS
    7 · 20 · 69 · Missing-value equations

  12. 12. 6 × x + 12 = 48. Find x.

    LHS=RHS
    6 · 12 · 48 · Missing-value equations
12 questions · Seed 51 · 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 + 12 = 112. Find x.

    10

    Subtract 12, then divide by 10: x = 10.

  2. 2. 10 × x + 14 = 114. Find x.

    10

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

  3. 3. 4 × x + 8 = 24. Find x.

    4

    Subtract 8, then divide by 4: x = 4.

  4. 4. 2 × x + 13 = 17. Find x.

    2

    Subtract 13, then divide by 2: x = 2.

  5. 5. 3 × x + 14 = 23. Find x.

    3

    Subtract 14, then divide by 3: x = 3.

  6. 6. 3 × x + 16 = 25. Find x.

    3

    Subtract 16, then divide by 3: x = 3.

  7. 7. 8 × x + 6 = 70. Find x.

    8

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

  8. 8. 6 × x + 15 = 51. Find x.

    6

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

  9. 9. 2 × x + 6 = 10. Find x.

    2

    Subtract 6, then divide by 2: x = 2.

  10. 10. 10 × x + 19 = 119. Find x.

    10

    Subtract 19, then divide by 10: x = 10.

  11. 11. 7 × x + 20 = 69. Find x.

    7

    Subtract 20, then divide by 7: x = 7.

  12. 12. 6 × x + 12 = 48. Find x.

    6

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

12 questions · Seed 51 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 10 × x + 12 = 112. Find x.

    LHS=RHS
    10 · 12 · 112 · Missing-value equations

  2. 2. 10 × x + 14 = 114. Find x.

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

  3. 3. 4 × x + 8 = 24. Find x.

    LHS=RHS
    4 · 8 · 24 · Missing-value equations

  4. 4. 2 × x + 13 = 17. Find x.

    LHS=RHS
    2 · 13 · 17 · Missing-value equations

  5. 5. 3 × x + 14 = 23. Find x.

    LHS=RHS
    3 · 14 · 23 · Missing-value equations

  6. 6. 3 × x + 16 = 25. Find x.

    LHS=RHS
    3 · 16 · 25 · Missing-value equations

  7. 7. 8 × x + 6 = 70. Find x.

    LHS=RHS
    8 · 6 · 70 · Missing-value equations

  8. 8. 6 × x + 15 = 51. Find x.

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

  9. 9. 2 × x + 6 = 10. Find x.

    LHS=RHS
    2 · 6 · 10 · Missing-value equations

  10. 10. 10 × x + 19 = 119. Find x.

    LHS=RHS
    10 · 19 · 119 · Missing-value equations

  11. 11. 7 × x + 20 = 69. Find x.

    LHS=RHS
    7 · 20 · 69 · Missing-value equations

  12. 12. 6 × x + 12 = 48. Find x.

    LHS=RHS
    6 · 12 · 48 · Missing-value equations
12 questions · Seed 51 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 10 × x + 12 = 112. Find x.

    10

    Subtract 12, then divide by 10: x = 10.

  2. 2. 10 × x + 14 = 114. Find x.

    10

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

  3. 3. 4 × x + 8 = 24. Find x.

    4

    Subtract 8, then divide by 4: x = 4.

  4. 4. 2 × x + 13 = 17. Find x.

    2

    Subtract 13, then divide by 2: x = 2.

  5. 5. 3 × x + 14 = 23. Find x.

    3

    Subtract 14, then divide by 3: x = 3.

  6. 6. 3 × x + 16 = 25. Find x.

    3

    Subtract 16, then divide by 3: x = 3.

  7. 7. 8 × x + 6 = 70. Find x.

    8

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

  8. 8. 6 × x + 15 = 51. Find x.

    6

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

  9. 9. 2 × x + 6 = 10. Find x.

    2

    Subtract 6, then divide by 2: x = 2.

  10. 10. 10 × x + 19 = 119. Find x.

    10

    Subtract 19, then divide by 10: x = 10.

  11. 11. 7 × x + 20 = 69. Find x.

    7

    Subtract 20, then divide by 7: x = 7.

  12. 12. 6 × x + 12 = 48. Find x.

    6

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

12 questions · Seed 51 · Age guidance, not curriculum certification