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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 4-6
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 1, 3, ____, 7, 9.
2. Find the missing number in the sequence: 3, 5, ____, 9, 11.
3. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4. Find the missing number in the sequence: 14, 16, ____, 20, 22.
5. Find the missing number in the sequence: 7, 12, ____, 22, 27.
6. Find the missing number in the sequence: 8, 10, ____, 14, 16.
7. Find the missing number in the sequence: 9, 14, ____, 24, 29.
8. Find the missing number in the sequence: 16, 21, ____, 31, 36.
9. Find the missing number in the sequence: 20, 21, ____, 23, 24.
10. Find the missing number in the sequence: 8, 13, ____, 23, 28.
11. Find the missing number in the sequence: 18, 23, ____, 33, 38.
12. Find the missing number in the sequence: 3, 8, ____, 18, 23.
12 questions · Seed 47 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 4-6
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
2. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7The sequence increases by 2 each step: 5 + 2 = 7.
3. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4The sequence increases by 1 each step: 3 + 1 = 4.
4. Find the missing number in the sequence: 14, 16, ____, 20, 22.
18The sequence increases by 2 each step: 16 + 2 = 18.
5. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
6. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12The sequence increases by 2 each step: 10 + 2 = 12.
7. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
8. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
9. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
10. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
11. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
12. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
12 questions · Seed 47 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 4-6
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 1, 3, ____, 7, 9.
2. Find the missing number in the sequence: 3, 5, ____, 9, 11.
3. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4. Find the missing number in the sequence: 14, 16, ____, 20, 22.
5. Find the missing number in the sequence: 7, 12, ____, 22, 27.
6. Find the missing number in the sequence: 8, 10, ____, 14, 16.
7. Find the missing number in the sequence: 9, 14, ____, 24, 29.
8. Find the missing number in the sequence: 16, 21, ____, 31, 36.
9. Find the missing number in the sequence: 20, 21, ____, 23, 24.
10. Find the missing number in the sequence: 8, 13, ____, 23, 28.
11. Find the missing number in the sequence: 18, 23, ____, 33, 38.
12. Find the missing number in the sequence: 3, 8, ____, 18, 23.
12 questions · Seed 47 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 4-6
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
2. Find the missing number in the sequence: 3, 5, ____, 9, 11.
7The sequence increases by 2 each step: 5 + 2 = 7.
3. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4The sequence increases by 1 each step: 3 + 1 = 4.
4. Find the missing number in the sequence: 14, 16, ____, 20, 22.
18The sequence increases by 2 each step: 16 + 2 = 18.
5. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
6. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12The sequence increases by 2 each step: 10 + 2 = 12.
7. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
8. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
9. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
10. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
11. Find the missing number in the sequence: 18, 23, ____, 33, 38.
28The sequence increases by 5 each step: 23 + 5 = 28.
12. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
12 questions · Seed 47 · Age guidance, not curriculum certification