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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: 1, 11, ____, 31, 41.
2. Find the missing number in the sequence: 6, 14, ____, 30, 38.
3. Find the missing number in the sequence: 18, 24, ____, 36, 42.
4. Find the missing number in the sequence: 4, 10, ____, 22, 28.
5. Find the missing number in the sequence: 16, 23, ____, 37, 44.
6. Find the missing number in the sequence: 16, 22, ____, 34, 40.
7. Find the missing number in the sequence: 16, 26, ____, 46, 56.
8. Find the missing number in the sequence: 13, 19, ____, 31, 37.
9. Find the missing number in the sequence: 16, 24, ____, 40, 48.
10. Find the missing number in the sequence: 6, 9, ____, 15, 18.
11. Find the missing number in the sequence: 10, 13, ____, 19, 22.
12. Find the missing number in the sequence: 11, 19, ____, 35, 43.
12 questions · Seed 95 · 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: 1, 11, ____, 31, 41.
21The sequence increases by 10 each step: 11 + 10 = 21.
2. Find the missing number in the sequence: 6, 14, ____, 30, 38.
22The sequence increases by 8 each step: 14 + 8 = 22.
3. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
4. Find the missing number in the sequence: 4, 10, ____, 22, 28.
16The sequence increases by 6 each step: 10 + 6 = 16.
5. Find the missing number in the sequence: 16, 23, ____, 37, 44.
30The sequence increases by 7 each step: 23 + 7 = 30.
6. Find the missing number in the sequence: 16, 22, ____, 34, 40.
28The sequence increases by 6 each step: 22 + 6 = 28.
7. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
8. Find the missing number in the sequence: 13, 19, ____, 31, 37.
25The sequence increases by 6 each step: 19 + 6 = 25.
9. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
10. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
11. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
12. Find the missing number in the sequence: 11, 19, ____, 35, 43.
27The sequence increases by 8 each step: 19 + 8 = 27.
12 questions · Seed 95 · 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: 1, 11, ____, 31, 41.
2. Find the missing number in the sequence: 6, 14, ____, 30, 38.
3. Find the missing number in the sequence: 18, 24, ____, 36, 42.
4. Find the missing number in the sequence: 4, 10, ____, 22, 28.
5. Find the missing number in the sequence: 16, 23, ____, 37, 44.
6. Find the missing number in the sequence: 16, 22, ____, 34, 40.
7. Find the missing number in the sequence: 16, 26, ____, 46, 56.
8. Find the missing number in the sequence: 13, 19, ____, 31, 37.
9. Find the missing number in the sequence: 16, 24, ____, 40, 48.
10. Find the missing number in the sequence: 6, 9, ____, 15, 18.
11. Find the missing number in the sequence: 10, 13, ____, 19, 22.
12. Find the missing number in the sequence: 11, 19, ____, 35, 43.
12 questions · Seed 95 · 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: 1, 11, ____, 31, 41.
21The sequence increases by 10 each step: 11 + 10 = 21.
2. Find the missing number in the sequence: 6, 14, ____, 30, 38.
22The sequence increases by 8 each step: 14 + 8 = 22.
3. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
4. Find the missing number in the sequence: 4, 10, ____, 22, 28.
16The sequence increases by 6 each step: 10 + 6 = 16.
5. Find the missing number in the sequence: 16, 23, ____, 37, 44.
30The sequence increases by 7 each step: 23 + 7 = 30.
6. Find the missing number in the sequence: 16, 22, ____, 34, 40.
28The sequence increases by 6 each step: 22 + 6 = 28.
7. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
8. Find the missing number in the sequence: 13, 19, ____, 31, 37.
25The sequence increases by 6 each step: 19 + 6 = 25.
9. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
10. Find the missing number in the sequence: 6, 9, ____, 15, 18.
12The sequence increases by 3 each step: 9 + 3 = 12.
11. Find the missing number in the sequence: 10, 13, ____, 19, 22.
16The sequence increases by 3 each step: 13 + 3 = 16.
12. Find the missing number in the sequence: 11, 19, ____, 35, 43.
27The sequence increases by 8 each step: 19 + 8 = 27.
12 questions · Seed 95 · Age guidance, not curriculum certification