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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: 16, 21, ____, 31, 36.
2. Find the missing number in the sequence: 1, 3, ____, 7, 9.
3. Find the missing number in the sequence: 4, 6, ____, 10, 12.
4. Find the missing number in the sequence: 15, 20, ____, 30, 35.
5. Find the missing number in the sequence: 8, 10, ____, 14, 16.
6. Find the missing number in the sequence: 2, 7, ____, 17, 22.
7. Find the missing number in the sequence: 3, 8, ____, 18, 23.
8. Find the missing number in the sequence: 9, 10, ____, 12, 13.
9. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10. Find the missing number in the sequence: 11, 12, ____, 14, 15.
11. Find the missing number in the sequence: 15, 16, ____, 18, 19.
12. Find the missing number in the sequence: 20, 22, ____, 26, 28.
12 questions · Seed 104745 · 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: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
2. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
3. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
4. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
5. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12The sequence increases by 2 each step: 10 + 2 = 12.
6. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
7. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
8. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
9. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10The sequence increases by 1 each step: 9 + 1 = 10.
10. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
11. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
12. Find the missing number in the sequence: 20, 22, ____, 26, 28.
24The sequence increases by 2 each step: 22 + 2 = 24.
12 questions · Seed 104745 · 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: 16, 21, ____, 31, 36.
2. Find the missing number in the sequence: 1, 3, ____, 7, 9.
3. Find the missing number in the sequence: 4, 6, ____, 10, 12.
4. Find the missing number in the sequence: 15, 20, ____, 30, 35.
5. Find the missing number in the sequence: 8, 10, ____, 14, 16.
6. Find the missing number in the sequence: 2, 7, ____, 17, 22.
7. Find the missing number in the sequence: 3, 8, ____, 18, 23.
8. Find the missing number in the sequence: 9, 10, ____, 12, 13.
9. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10. Find the missing number in the sequence: 11, 12, ____, 14, 15.
11. Find the missing number in the sequence: 15, 16, ____, 18, 19.
12. Find the missing number in the sequence: 20, 22, ____, 26, 28.
12 questions · Seed 104745 · 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: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
2. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
3. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
4. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
5. Find the missing number in the sequence: 8, 10, ____, 14, 16.
12The sequence increases by 2 each step: 10 + 2 = 12.
6. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
7. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
8. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
9. Find the missing number in the sequence: 8, 9, ____, 11, 12.
10The sequence increases by 1 each step: 9 + 1 = 10.
10. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
11. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
12. Find the missing number in the sequence: 20, 22, ____, 26, 28.
24The sequence increases by 2 each step: 22 + 2 = 24.
12 questions · Seed 104745 · Age guidance, not curriculum certification