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MathsAges 7-9

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 7-9

Missing-value equations

Take your time. Show your thinking.

  1. 1. 5 × x + 10 = 35. Find x.

    LHS=RHS
    5 · 10 · 35 · Missing-value equations

  2. 2. 8 × x + 6 = 70. Find x.

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

  3. 3. 12 × x + 9 = 153. Find x.

    LHS=RHS
    12 · 9 · 153 · Missing-value equations

  4. 4. 10 × x + 7 = 107. Find x.

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

  5. 5. 11 × x + 12 = 133. Find x.

    LHS=RHS
    11 · 12 · 133 · Missing-value equations

  6. 6. 12 × x + 10 = 154. Find x.

    LHS=RHS
    12 · 10 · 154 · Missing-value equations

  7. 7. 8 × x + 5 = 69. Find x.

    LHS=RHS
    8 · 5 · 69 · Missing-value equations

  8. 8. 4 × x + 7 = 23. Find x.

    LHS=RHS
    4 · 7 · 23 · Missing-value equations

  9. 9. 2 × x + 10 = 14. Find x.

    LHS=RHS
    2 · 10 · 14 · Missing-value equations

  10. 10. 4 × x + 10 = 26. Find x.

    LHS=RHS
    4 · 10 · 26 · Missing-value equations

  11. 11. 10 × x + 8 = 108. Find x.

    LHS=RHS
    10 · 8 · 108 · Missing-value equations

  12. 12. 4 × x + 9 = 25. Find x.

    LHS=RHS
    4 · 9 · 25 · Missing-value equations
12 questions · Seed 48 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 5 × x + 10 = 35. Find x.

    5

    Subtract 10, then divide by 5: x = 5.

  2. 2. 8 × x + 6 = 70. Find x.

    8

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

  3. 3. 12 × x + 9 = 153. Find x.

    12

    Subtract 9, then divide by 12: x = 12.

  4. 4. 10 × x + 7 = 107. Find x.

    10

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

  5. 5. 11 × x + 12 = 133. Find x.

    11

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

  6. 6. 12 × x + 10 = 154. Find x.

    12

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

  7. 7. 8 × x + 5 = 69. Find x.

    8

    Subtract 5, then divide by 8: x = 8.

  8. 8. 4 × x + 7 = 23. Find x.

    4

    Subtract 7, then divide by 4: x = 4.

  9. 9. 2 × x + 10 = 14. Find x.

    2

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

  10. 10. 4 × x + 10 = 26. Find x.

    4

    Subtract 10, then divide by 4: x = 4.

  11. 11. 10 × x + 8 = 108. Find x.

    10

    Subtract 8, then divide by 10: x = 10.

  12. 12. 4 × x + 9 = 25. Find x.

    4

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

12 questions · Seed 48 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9

Missing-value equations

Take your time. Show your thinking.

  1. 1. 5 × x + 10 = 35. Find x.

    LHS=RHS
    5 · 10 · 35 · Missing-value equations

  2. 2. 8 × x + 6 = 70. Find x.

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

  3. 3. 12 × x + 9 = 153. Find x.

    LHS=RHS
    12 · 9 · 153 · Missing-value equations

  4. 4. 10 × x + 7 = 107. Find x.

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

  5. 5. 11 × x + 12 = 133. Find x.

    LHS=RHS
    11 · 12 · 133 · Missing-value equations

  6. 6. 12 × x + 10 = 154. Find x.

    LHS=RHS
    12 · 10 · 154 · Missing-value equations

  7. 7. 8 × x + 5 = 69. Find x.

    LHS=RHS
    8 · 5 · 69 · Missing-value equations

  8. 8. 4 × x + 7 = 23. Find x.

    LHS=RHS
    4 · 7 · 23 · Missing-value equations

  9. 9. 2 × x + 10 = 14. Find x.

    LHS=RHS
    2 · 10 · 14 · Missing-value equations

  10. 10. 4 × x + 10 = 26. Find x.

    LHS=RHS
    4 · 10 · 26 · Missing-value equations

  11. 11. 10 × x + 8 = 108. Find x.

    LHS=RHS
    10 · 8 · 108 · Missing-value equations

  12. 12. 4 × x + 9 = 25. Find x.

    LHS=RHS
    4 · 9 · 25 · Missing-value equations
12 questions · Seed 48 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 5 × x + 10 = 35. Find x.

    5

    Subtract 10, then divide by 5: x = 5.

  2. 2. 8 × x + 6 = 70. Find x.

    8

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

  3. 3. 12 × x + 9 = 153. Find x.

    12

    Subtract 9, then divide by 12: x = 12.

  4. 4. 10 × x + 7 = 107. Find x.

    10

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

  5. 5. 11 × x + 12 = 133. Find x.

    11

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

  6. 6. 12 × x + 10 = 154. Find x.

    12

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

  7. 7. 8 × x + 5 = 69. Find x.

    8

    Subtract 5, then divide by 8: x = 8.

  8. 8. 4 × x + 7 = 23. Find x.

    4

    Subtract 7, then divide by 4: x = 4.

  9. 9. 2 × x + 10 = 14. Find x.

    2

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

  10. 10. 4 × x + 10 = 26. Find x.

    4

    Subtract 10, then divide by 4: x = 4.

  11. 11. 10 × x + 8 = 108. Find x.

    10

    Subtract 8, then divide by 10: x = 10.

  12. 12. 4 × x + 9 = 25. Find x.

    4

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

12 questions · Seed 48 · Age guidance, not curriculum certification