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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 + 8 = 108. Find x.

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

  2. 2. 10 × x + 9 = 109. Find x.

    LHS=RHS
    10 · 9 · 109 · Missing-value equations

  3. 3. 4 × x + 5 = 21. Find x.

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

  4. 4. 2 × x + 8 = 12. Find x.

    LHS=RHS
    2 · 8 · 12 · Missing-value equations

  5. 5. 3 × x + 9 = 18. Find x.

    LHS=RHS
    3 · 9 · 18 · Missing-value equations

  6. 6. 3 × x + 10 = 19. Find x.

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

  7. 7. 8 × x + 4 = 68. Find x.

    LHS=RHS
    8 · 4 · 68 · Missing-value equations

  8. 8. 6 × x + 9 = 45. Find x.

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

  9. 9. 2 × x + 4 = 8. Find x.

    LHS=RHS
    2 · 4 · 8 · Missing-value equations

  10. 10. 10 × x + 12 = 112. Find x.

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

  11. 11. 7 × x + 12 = 61. Find x.

    LHS=RHS
    7 · 12 · 61 · Missing-value equations

  12. 12. 6 × x + 7 = 43. Find x.

    LHS=RHS
    6 · 7 · 43 · Missing-value equations
12 questions · Seed 51 · 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 + 8 = 108. Find x.

    10

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

  2. 2. 10 × x + 9 = 109. Find x.

    10

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

  3. 3. 4 × x + 5 = 21. Find x.

    4

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

  4. 4. 2 × x + 8 = 12. Find x.

    2

    Subtract 8, then divide by 2: x = 2.

  5. 5. 3 × x + 9 = 18. Find x.

    3

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

  6. 6. 3 × x + 10 = 19. Find x.

    3

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

  7. 7. 8 × x + 4 = 68. Find x.

    8

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

  8. 8. 6 × x + 9 = 45. Find x.

    6

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

  9. 9. 2 × x + 4 = 8. Find x.

    2

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

  10. 10. 10 × x + 12 = 112. Find x.

    10

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

  11. 11. 7 × x + 12 = 61. Find x.

    7

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

  12. 12. 6 × x + 7 = 43. Find x.

    6

    Subtract 7, then divide by 6: x = 6.

12 questions · Seed 51 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9

Missing-value equations

Take your time. Show your thinking.

  1. 1. 10 × x + 8 = 108. Find x.

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

  2. 2. 10 × x + 9 = 109. Find x.

    LHS=RHS
    10 · 9 · 109 · Missing-value equations

  3. 3. 4 × x + 5 = 21. Find x.

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

  4. 4. 2 × x + 8 = 12. Find x.

    LHS=RHS
    2 · 8 · 12 · Missing-value equations

  5. 5. 3 × x + 9 = 18. Find x.

    LHS=RHS
    3 · 9 · 18 · Missing-value equations

  6. 6. 3 × x + 10 = 19. Find x.

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

  7. 7. 8 × x + 4 = 68. Find x.

    LHS=RHS
    8 · 4 · 68 · Missing-value equations

  8. 8. 6 × x + 9 = 45. Find x.

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

  9. 9. 2 × x + 4 = 8. Find x.

    LHS=RHS
    2 · 4 · 8 · Missing-value equations

  10. 10. 10 × x + 12 = 112. Find x.

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

  11. 11. 7 × x + 12 = 61. Find x.

    LHS=RHS
    7 · 12 · 61 · Missing-value equations

  12. 12. 6 × x + 7 = 43. Find x.

    LHS=RHS
    6 · 7 · 43 · Missing-value equations
12 questions · Seed 51 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 10 × x + 8 = 108. Find x.

    10

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

  2. 2. 10 × x + 9 = 109. Find x.

    10

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

  3. 3. 4 × x + 5 = 21. Find x.

    4

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

  4. 4. 2 × x + 8 = 12. Find x.

    2

    Subtract 8, then divide by 2: x = 2.

  5. 5. 3 × x + 9 = 18. Find x.

    3

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

  6. 6. 3 × x + 10 = 19. Find x.

    3

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

  7. 7. 8 × x + 4 = 68. Find x.

    8

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

  8. 8. 6 × x + 9 = 45. Find x.

    6

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

  9. 9. 2 × x + 4 = 8. Find x.

    2

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

  10. 10. 10 × x + 12 = 112. Find x.

    10

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

  11. 11. 7 × x + 12 = 61. Find x.

    7

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

  12. 12. 6 × x + 7 = 43. Find x.

    6

    Subtract 7, then divide by 6: x = 6.

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