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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: 6, 16, ____, 36, 46.
2. Find the missing number in the sequence: 2, 6, ____, 14, 18.
3. Find the missing number in the sequence: 10, 16, ____, 28, 34.
4. Find the missing number in the sequence: 20, 24, ____, 32, 36.
5. Find the missing number in the sequence: 15, 18, ____, 24, 27.
6. Find the missing number in the sequence: 17, 24, ____, 38, 45.
7. Find the missing number in the sequence: 17, 21, ____, 29, 33.
8. Find the missing number in the sequence: 9, 16, ____, 30, 37.
9. Find the missing number in the sequence: 1, 9, ____, 25, 33.
10. Find the missing number in the sequence: 19, 29, ____, 49, 59.
11. Find the missing number in the sequence: 11, 15, ____, 23, 27.
12. Find the missing number in the sequence: 15, 19, ____, 27, 31.
12 questions · Seed 84 · 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: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
2. Find the missing number in the sequence: 2, 6, ____, 14, 18.
10The sequence increases by 4 each step: 6 + 4 = 10.
3. Find the missing number in the sequence: 10, 16, ____, 28, 34.
22The sequence increases by 6 each step: 16 + 6 = 22.
4. Find the missing number in the sequence: 20, 24, ____, 32, 36.
28The sequence increases by 4 each step: 24 + 4 = 28.
5. Find the missing number in the sequence: 15, 18, ____, 24, 27.
21The sequence increases by 3 each step: 18 + 3 = 21.
6. Find the missing number in the sequence: 17, 24, ____, 38, 45.
31The sequence increases by 7 each step: 24 + 7 = 31.
7. Find the missing number in the sequence: 17, 21, ____, 29, 33.
25The sequence increases by 4 each step: 21 + 4 = 25.
8. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
9. Find the missing number in the sequence: 1, 9, ____, 25, 33.
17The sequence increases by 8 each step: 9 + 8 = 17.
10. Find the missing number in the sequence: 19, 29, ____, 49, 59.
39The sequence increases by 10 each step: 29 + 10 = 39.
11. Find the missing number in the sequence: 11, 15, ____, 23, 27.
19The sequence increases by 4 each step: 15 + 4 = 19.
12. Find the missing number in the sequence: 15, 19, ____, 27, 31.
23The sequence increases by 4 each step: 19 + 4 = 23.
12 questions · Seed 84 · 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: 6, 16, ____, 36, 46.
2. Find the missing number in the sequence: 2, 6, ____, 14, 18.
3. Find the missing number in the sequence: 10, 16, ____, 28, 34.
4. Find the missing number in the sequence: 20, 24, ____, 32, 36.
5. Find the missing number in the sequence: 15, 18, ____, 24, 27.
6. Find the missing number in the sequence: 17, 24, ____, 38, 45.
7. Find the missing number in the sequence: 17, 21, ____, 29, 33.
8. Find the missing number in the sequence: 9, 16, ____, 30, 37.
9. Find the missing number in the sequence: 1, 9, ____, 25, 33.
10. Find the missing number in the sequence: 19, 29, ____, 49, 59.
11. Find the missing number in the sequence: 11, 15, ____, 23, 27.
12. Find the missing number in the sequence: 15, 19, ____, 27, 31.
12 questions · Seed 84 · 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: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
2. Find the missing number in the sequence: 2, 6, ____, 14, 18.
10The sequence increases by 4 each step: 6 + 4 = 10.
3. Find the missing number in the sequence: 10, 16, ____, 28, 34.
22The sequence increases by 6 each step: 16 + 6 = 22.
4. Find the missing number in the sequence: 20, 24, ____, 32, 36.
28The sequence increases by 4 each step: 24 + 4 = 28.
5. Find the missing number in the sequence: 15, 18, ____, 24, 27.
21The sequence increases by 3 each step: 18 + 3 = 21.
6. Find the missing number in the sequence: 17, 24, ____, 38, 45.
31The sequence increases by 7 each step: 24 + 7 = 31.
7. Find the missing number in the sequence: 17, 21, ____, 29, 33.
25The sequence increases by 4 each step: 21 + 4 = 25.
8. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
9. Find the missing number in the sequence: 1, 9, ____, 25, 33.
17The sequence increases by 8 each step: 9 + 8 = 17.
10. Find the missing number in the sequence: 19, 29, ____, 49, 59.
39The sequence increases by 10 each step: 29 + 10 = 39.
11. Find the missing number in the sequence: 11, 15, ____, 23, 27.
19The sequence increases by 4 each step: 15 + 4 = 19.
12. Find the missing number in the sequence: 15, 19, ____, 27, 31.
23The sequence increases by 4 each step: 19 + 4 = 23.
12 questions · Seed 84 · Age guidance, not curriculum certification