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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 + 19 = 119. Find x.

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

  2. 2. 4 × x + 7 = 23. Find x.

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

  3. 3. 2 × x + 6 = 10. Find x.

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

  4. 4. 9 × x + 13 = 94. Find x.

    LHS=RHS
    9 · 13 · 94 · Missing-value equations

  5. 5. 11 × x + 3 = 124. Find x.

    LHS=RHS
    11 · 3 · 124 · Missing-value equations

  6. 6. 11 × x + 6 = 127. Find x.

    LHS=RHS
    11 · 6 · 127 · Missing-value equations

  7. 7. 7 × x + 16 = 65. Find x.

    LHS=RHS
    7 · 16 · 65 · Missing-value equations

  8. 8. 6 × x + 10 = 46. Find x.

    LHS=RHS
    6 · 10 · 46 · Missing-value equations

  9. 9. 2 × x + 3 = 7. Find x.

    LHS=RHS
    2 · 3 · 7 · Missing-value equations

  10. 10. 11 × x + 8 = 129. Find x.

    LHS=RHS
    11 · 8 · 129 · Missing-value equations

  11. 11. 7 × x + 20 = 69. Find x.

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

  12. 12. 8 × x + 14 = 78. Find x.

    LHS=RHS
    8 · 14 · 78 · Missing-value equations
12 questions · Seed 104734 · 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 + 19 = 119. Find x.

    10

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

  2. 2. 4 × x + 7 = 23. Find x.

    4

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

  3. 3. 2 × x + 6 = 10. Find x.

    2

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

  4. 4. 9 × x + 13 = 94. Find x.

    9

    Subtract 13, then divide by 9: x = 9.

  5. 5. 11 × x + 3 = 124. Find x.

    11

    Subtract 3, then divide by 11: x = 11.

  6. 6. 11 × x + 6 = 127. Find x.

    11

    Subtract 6, then divide by 11: x = 11.

  7. 7. 7 × x + 16 = 65. Find x.

    7

    Subtract 16, then divide by 7: x = 7.

  8. 8. 6 × x + 10 = 46. Find x.

    6

    Subtract 10, then divide by 6: x = 6.

  9. 9. 2 × x + 3 = 7. Find x.

    2

    Subtract 3, then divide by 2: x = 2.

  10. 10. 11 × x + 8 = 129. Find x.

    11

    Subtract 8, then divide by 11: x = 11.

  11. 11. 7 × x + 20 = 69. Find x.

    7

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

  12. 12. 8 × x + 14 = 78. Find x.

    8

    Subtract 14, then divide by 8: x = 8.

12 questions · Seed 104734 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 10-12

Missing-value equations

Take your time. Show your thinking.

  1. 1. 10 × x + 19 = 119. Find x.

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

  2. 2. 4 × x + 7 = 23. Find x.

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

  3. 3. 2 × x + 6 = 10. Find x.

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

  4. 4. 9 × x + 13 = 94. Find x.

    LHS=RHS
    9 · 13 · 94 · Missing-value equations

  5. 5. 11 × x + 3 = 124. Find x.

    LHS=RHS
    11 · 3 · 124 · Missing-value equations

  6. 6. 11 × x + 6 = 127. Find x.

    LHS=RHS
    11 · 6 · 127 · Missing-value equations

  7. 7. 7 × x + 16 = 65. Find x.

    LHS=RHS
    7 · 16 · 65 · Missing-value equations

  8. 8. 6 × x + 10 = 46. Find x.

    LHS=RHS
    6 · 10 · 46 · Missing-value equations

  9. 9. 2 × x + 3 = 7. Find x.

    LHS=RHS
    2 · 3 · 7 · Missing-value equations

  10. 10. 11 × x + 8 = 129. Find x.

    LHS=RHS
    11 · 8 · 129 · Missing-value equations

  11. 11. 7 × x + 20 = 69. Find x.

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

  12. 12. 8 × x + 14 = 78. Find x.

    LHS=RHS
    8 · 14 · 78 · Missing-value equations
12 questions · Seed 104734 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 10-12

Missing-value equations

Answers and reasoning. Review before teaching.

  1. 1. 10 × x + 19 = 119. Find x.

    10

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

  2. 2. 4 × x + 7 = 23. Find x.

    4

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

  3. 3. 2 × x + 6 = 10. Find x.

    2

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

  4. 4. 9 × x + 13 = 94. Find x.

    9

    Subtract 13, then divide by 9: x = 9.

  5. 5. 11 × x + 3 = 124. Find x.

    11

    Subtract 3, then divide by 11: x = 11.

  6. 6. 11 × x + 6 = 127. Find x.

    11

    Subtract 6, then divide by 11: x = 11.

  7. 7. 7 × x + 16 = 65. Find x.

    7

    Subtract 16, then divide by 7: x = 7.

  8. 8. 6 × x + 10 = 46. Find x.

    6

    Subtract 10, then divide by 6: x = 6.

  9. 9. 2 × x + 3 = 7. Find x.

    2

    Subtract 3, then divide by 2: x = 2.

  10. 10. 11 × x + 8 = 129. Find x.

    11

    Subtract 8, then divide by 11: x = 11.

  11. 11. 7 × x + 20 = 69. Find x.

    7

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

  12. 12. 8 × x + 14 = 78. Find x.

    8

    Subtract 14, then divide by 8: x = 8.

12 questions · Seed 104734 · Age guidance, not curriculum certification