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Missing sequence terms
Use the constant step size between terms to find the missing middle number in a sequence. Review suitability for your learners before teaching.
Worksheet StudioPractice pack · Ages 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 4, 14, ____, 34, 44.
2. Find the missing number in the sequence: 18, 26, ____, 42, 50.
3. Find the missing number in the sequence: 11, 18, ____, 32, 39.
4. Find the missing number in the sequence: 17, 23, ____, 35, 41.
5. Find the missing number in the sequence: 11, 19, ____, 35, 43.
6. Find the missing number in the sequence: 5, 8, ____, 14, 17.
7. Find the missing number in the sequence: 16, 24, ____, 40, 48.
8. Find the missing number in the sequence: 10, 14, ____, 22, 26.
9. Find the missing number in the sequence: 12, 15, ____, 21, 24.
10. Find the missing number in the sequence: 10, 17, ____, 31, 38.
11. Find the missing number in the sequence: 6, 10, ____, 18, 22.
12. Find the missing number in the sequence: 3, 9, ____, 21, 27.
12 questions · Seed 69 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 4, 14, ____, 34, 44.
24The sequence increases by 10 each step: 14 + 10 = 24.
2. Find the missing number in the sequence: 18, 26, ____, 42, 50.
34The sequence increases by 8 each step: 26 + 8 = 34.
3. Find the missing number in the sequence: 11, 18, ____, 32, 39.
25The sequence increases by 7 each step: 18 + 7 = 25.
4. Find the missing number in the sequence: 17, 23, ____, 35, 41.
29The sequence increases by 6 each step: 23 + 6 = 29.
5. Find the missing number in the sequence: 11, 19, ____, 35, 43.
27The sequence increases by 8 each step: 19 + 8 = 27.
6. Find the missing number in the sequence: 5, 8, ____, 14, 17.
11The sequence increases by 3 each step: 8 + 3 = 11.
7. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
8. Find the missing number in the sequence: 10, 14, ____, 22, 26.
18The sequence increases by 4 each step: 14 + 4 = 18.
9. Find the missing number in the sequence: 12, 15, ____, 21, 24.
18The sequence increases by 3 each step: 15 + 3 = 18.
10. Find the missing number in the sequence: 10, 17, ____, 31, 38.
24The sequence increases by 7 each step: 17 + 7 = 24.
11. Find the missing number in the sequence: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
12. Find the missing number in the sequence: 3, 9, ____, 21, 27.
15The sequence increases by 6 each step: 9 + 6 = 15.
12 questions · Seed 69 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 4, 14, ____, 34, 44.
2. Find the missing number in the sequence: 18, 26, ____, 42, 50.
3. Find the missing number in the sequence: 11, 18, ____, 32, 39.
4. Find the missing number in the sequence: 17, 23, ____, 35, 41.
5. Find the missing number in the sequence: 11, 19, ____, 35, 43.
6. Find the missing number in the sequence: 5, 8, ____, 14, 17.
7. Find the missing number in the sequence: 16, 24, ____, 40, 48.
8. Find the missing number in the sequence: 10, 14, ____, 22, 26.
9. Find the missing number in the sequence: 12, 15, ____, 21, 24.
10. Find the missing number in the sequence: 10, 17, ____, 31, 38.
11. Find the missing number in the sequence: 6, 10, ____, 18, 22.
12. Find the missing number in the sequence: 3, 9, ____, 21, 27.
12 questions · Seed 69 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 4, 14, ____, 34, 44.
24The sequence increases by 10 each step: 14 + 10 = 24.
2. Find the missing number in the sequence: 18, 26, ____, 42, 50.
34The sequence increases by 8 each step: 26 + 8 = 34.
3. Find the missing number in the sequence: 11, 18, ____, 32, 39.
25The sequence increases by 7 each step: 18 + 7 = 25.
4. Find the missing number in the sequence: 17, 23, ____, 35, 41.
29The sequence increases by 6 each step: 23 + 6 = 29.
5. Find the missing number in the sequence: 11, 19, ____, 35, 43.
27The sequence increases by 8 each step: 19 + 8 = 27.
6. Find the missing number in the sequence: 5, 8, ____, 14, 17.
11The sequence increases by 3 each step: 8 + 3 = 11.
7. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
8. Find the missing number in the sequence: 10, 14, ____, 22, 26.
18The sequence increases by 4 each step: 14 + 4 = 18.
9. Find the missing number in the sequence: 12, 15, ____, 21, 24.
18The sequence increases by 3 each step: 15 + 3 = 18.
10. Find the missing number in the sequence: 10, 17, ____, 31, 38.
24The sequence increases by 7 each step: 17 + 7 = 24.
11. Find the missing number in the sequence: 6, 10, ____, 18, 22.
14The sequence increases by 4 each step: 10 + 4 = 14.
12. Find the missing number in the sequence: 3, 9, ____, 21, 27.
15The sequence increases by 6 each step: 9 + 6 = 15.
12 questions · Seed 69 · Age guidance, not curriculum certification