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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: 19, 27, ____, 43, 51.
2. Find the missing number in the sequence: 4, 7, ____, 13, 16.
3. Find the missing number in the sequence: 3, 12, ____, 30, 39.
4. Find the missing number in the sequence: 3, 13, ____, 33, 43.
5. Find the missing number in the sequence: 14, 21, ____, 35, 42.
6. Find the missing number in the sequence: 20, 24, ____, 32, 36.
7. Find the missing number in the sequence: 7, 17, ____, 37, 47.
8. Find the missing number in the sequence: 9, 17, ____, 33, 41.
9. Find the missing number in the sequence: 4, 11, ____, 25, 32.
10. Find the missing number in the sequence: 13, 21, ____, 37, 45.
11. Find the missing number in the sequence: 2, 12, ____, 32, 42.
12. Find the missing number in the sequence: 19, 29, ____, 49, 59.
12 questions · Seed 89 · 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: 19, 27, ____, 43, 51.
35The sequence increases by 8 each step: 27 + 8 = 35.
2. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
3. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
4. Find the missing number in the sequence: 3, 13, ____, 33, 43.
23The sequence increases by 10 each step: 13 + 10 = 23.
5. Find the missing number in the sequence: 14, 21, ____, 35, 42.
28The sequence increases by 7 each step: 21 + 7 = 28.
6. Find the missing number in the sequence: 20, 24, ____, 32, 36.
28The sequence increases by 4 each step: 24 + 4 = 28.
7. Find the missing number in the sequence: 7, 17, ____, 37, 47.
27The sequence increases by 10 each step: 17 + 10 = 27.
8. Find the missing number in the sequence: 9, 17, ____, 33, 41.
25The sequence increases by 8 each step: 17 + 8 = 25.
9. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
10. Find the missing number in the sequence: 13, 21, ____, 37, 45.
29The sequence increases by 8 each step: 21 + 8 = 29.
11. Find the missing number in the sequence: 2, 12, ____, 32, 42.
22The sequence increases by 10 each step: 12 + 10 = 22.
12. Find the missing number in the sequence: 19, 29, ____, 49, 59.
39The sequence increases by 10 each step: 29 + 10 = 39.
12 questions · Seed 89 · 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: 19, 27, ____, 43, 51.
2. Find the missing number in the sequence: 4, 7, ____, 13, 16.
3. Find the missing number in the sequence: 3, 12, ____, 30, 39.
4. Find the missing number in the sequence: 3, 13, ____, 33, 43.
5. Find the missing number in the sequence: 14, 21, ____, 35, 42.
6. Find the missing number in the sequence: 20, 24, ____, 32, 36.
7. Find the missing number in the sequence: 7, 17, ____, 37, 47.
8. Find the missing number in the sequence: 9, 17, ____, 33, 41.
9. Find the missing number in the sequence: 4, 11, ____, 25, 32.
10. Find the missing number in the sequence: 13, 21, ____, 37, 45.
11. Find the missing number in the sequence: 2, 12, ____, 32, 42.
12. Find the missing number in the sequence: 19, 29, ____, 49, 59.
12 questions · Seed 89 · 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: 19, 27, ____, 43, 51.
35The sequence increases by 8 each step: 27 + 8 = 35.
2. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
3. Find the missing number in the sequence: 3, 12, ____, 30, 39.
21The sequence increases by 9 each step: 12 + 9 = 21.
4. Find the missing number in the sequence: 3, 13, ____, 33, 43.
23The sequence increases by 10 each step: 13 + 10 = 23.
5. Find the missing number in the sequence: 14, 21, ____, 35, 42.
28The sequence increases by 7 each step: 21 + 7 = 28.
6. Find the missing number in the sequence: 20, 24, ____, 32, 36.
28The sequence increases by 4 each step: 24 + 4 = 28.
7. Find the missing number in the sequence: 7, 17, ____, 37, 47.
27The sequence increases by 10 each step: 17 + 10 = 27.
8. Find the missing number in the sequence: 9, 17, ____, 33, 41.
25The sequence increases by 8 each step: 17 + 8 = 25.
9. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
10. Find the missing number in the sequence: 13, 21, ____, 37, 45.
29The sequence increases by 8 each step: 21 + 8 = 29.
11. Find the missing number in the sequence: 2, 12, ____, 32, 42.
22The sequence increases by 10 each step: 12 + 10 = 22.
12. Find the missing number in the sequence: 19, 29, ____, 49, 59.
39The sequence increases by 10 each step: 29 + 10 = 39.
12 questions · Seed 89 · Age guidance, not curriculum certification