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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. 10 × x + 5 = 105. Find x.

    LHS=RHS
    10 · 5 · 105 · Missing-value equations

  2. 2. 4 × x + 5 = 21. Find x.

    LHS=RHS
    4 · 5 · 21 · Missing-value equations

  3. 3. 10 × x + 11 = 111. Find x.

    LHS=RHS
    10 · 11 · 111 · Missing-value equations

  4. 4. 5 × x + 11 = 36. Find x.

    LHS=RHS
    5 · 11 · 36 · Missing-value equations

  5. 5. 5 × x + 12 = 37. Find x.

    LHS=RHS
    5 · 12 · 37 · Missing-value equations

  6. 6. 9 × x + 5 = 86. Find x.

    LHS=RHS
    9 · 5 · 86 · Missing-value equations

  7. 7. 3 × x + 10 = 19. Find x.

    LHS=RHS
    3 · 10 · 19 · Missing-value equations

  8. 8. 5 × x + 5 = 30. Find x.

    LHS=RHS
    5 · 5 · 30 · Missing-value equations

  9. 9. 6 × x + 9 = 45. Find x.

    LHS=RHS
    6 · 9 · 45 · Missing-value equations

  10. 10. 5 × x + 10 = 35. Find x.

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

  11. 11. 10 × x + 2 = 102. Find x.

    LHS=RHS
    10 · 2 · 102 · Missing-value equations

  12. 12. 3 × x + 9 = 18. Find x.

    LHS=RHS
    3 · 9 · 18 · Missing-value equations
12 questions · Seed 50 · 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. 10 × x + 5 = 105. Find x.

    10

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

  2. 2. 4 × x + 5 = 21. Find x.

    4

    Subtract 5, then divide by 4: x = 4.

  3. 3. 10 × x + 11 = 111. Find x.

    10

    Subtract 11, then divide by 10: x = 10.

  4. 4. 5 × x + 11 = 36. Find x.

    5

    Subtract 11, then divide by 5: x = 5.

  5. 5. 5 × x + 12 = 37. Find x.

    5

    Subtract 12, then divide by 5: x = 5.

  6. 6. 9 × x + 5 = 86. Find x.

    9

    Subtract 5, then divide by 9: x = 9.

  7. 7. 3 × x + 10 = 19. Find x.

    3

    Subtract 10, then divide by 3: x = 3.

  8. 8. 5 × x + 5 = 30. Find x.

    5

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

  9. 9. 6 × x + 9 = 45. Find x.

    6

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

  10. 10. 5 × x + 10 = 35. Find x.

    5

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

  11. 11. 10 × x + 2 = 102. Find x.

    10

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

  12. 12. 3 × x + 9 = 18. Find x.

    3

    Subtract 9, then divide by 3: x = 3.

12 questions · Seed 50 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9

Missing-value equations

Take your time. Show your thinking.

  1. 1. 10 × x + 5 = 105. Find x.

    LHS=RHS
    10 · 5 · 105 · Missing-value equations

  2. 2. 4 × x + 5 = 21. Find x.

    LHS=RHS
    4 · 5 · 21 · Missing-value equations

  3. 3. 10 × x + 11 = 111. Find x.

    LHS=RHS
    10 · 11 · 111 · Missing-value equations

  4. 4. 5 × x + 11 = 36. Find x.

    LHS=RHS
    5 · 11 · 36 · Missing-value equations

  5. 5. 5 × x + 12 = 37. Find x.

    LHS=RHS
    5 · 12 · 37 · Missing-value equations

  6. 6. 9 × x + 5 = 86. Find x.

    LHS=RHS
    9 · 5 · 86 · Missing-value equations

  7. 7. 3 × x + 10 = 19. Find x.

    LHS=RHS
    3 · 10 · 19 · Missing-value equations

  8. 8. 5 × x + 5 = 30. Find x.

    LHS=RHS
    5 · 5 · 30 · Missing-value equations

  9. 9. 6 × x + 9 = 45. Find x.

    LHS=RHS
    6 · 9 · 45 · Missing-value equations

  10. 10. 5 × x + 10 = 35. Find x.

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

  11. 11. 10 × x + 2 = 102. Find x.

    LHS=RHS
    10 · 2 · 102 · Missing-value equations

  12. 12. 3 × x + 9 = 18. Find x.

    LHS=RHS
    3 · 9 · 18 · Missing-value equations
12 questions · Seed 50 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 10 × x + 5 = 105. Find x.

    10

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

  2. 2. 4 × x + 5 = 21. Find x.

    4

    Subtract 5, then divide by 4: x = 4.

  3. 3. 10 × x + 11 = 111. Find x.

    10

    Subtract 11, then divide by 10: x = 10.

  4. 4. 5 × x + 11 = 36. Find x.

    5

    Subtract 11, then divide by 5: x = 5.

  5. 5. 5 × x + 12 = 37. Find x.

    5

    Subtract 12, then divide by 5: x = 5.

  6. 6. 9 × x + 5 = 86. Find x.

    9

    Subtract 5, then divide by 9: x = 9.

  7. 7. 3 × x + 10 = 19. Find x.

    3

    Subtract 10, then divide by 3: x = 3.

  8. 8. 5 × x + 5 = 30. Find x.

    5

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

  9. 9. 6 × x + 9 = 45. Find x.

    6

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

  10. 10. 5 × x + 10 = 35. Find x.

    5

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

  11. 11. 10 × x + 2 = 102. Find x.

    10

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

  12. 12. 3 × x + 9 = 18. Find x.

    3

    Subtract 9, then divide by 3: x = 3.

12 questions · Seed 50 · Age guidance, not curriculum certification