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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: 19, 20, ____, 22, 23.
2. Find the missing number in the sequence: 15, 17, ____, 21, 23.
3. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4. Find the missing number in the sequence: 6, 7, ____, 9, 10.
5. Find the missing number in the sequence: 12, 13, ____, 15, 16.
6. Find the missing number in the sequence: 11, 16, ____, 26, 31.
7. Find the missing number in the sequence: 10, 11, ____, 13, 14.
8. Find the missing number in the sequence: 9, 14, ____, 24, 29.
9. Find the missing number in the sequence: 18, 20, ____, 24, 26.
10. Find the missing number in the sequence: 15, 20, ____, 30, 35.
11. Find the missing number in the sequence: 9, 10, ____, 12, 13.
12. Find the missing number in the sequence: 7, 12, ____, 22, 27.
12 questions · Seed 104753 · 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: 19, 20, ____, 22, 23.
21The sequence increases by 1 each step: 20 + 1 = 21.
2. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
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: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
5. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
6. Find the missing number in the sequence: 11, 16, ____, 26, 31.
21The sequence increases by 5 each step: 16 + 5 = 21.
7. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
8. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
9. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22The sequence increases by 2 each step: 20 + 2 = 22.
10. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
11. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
12. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
12 questions · Seed 104753 · 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: 19, 20, ____, 22, 23.
2. Find the missing number in the sequence: 15, 17, ____, 21, 23.
3. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4. Find the missing number in the sequence: 6, 7, ____, 9, 10.
5. Find the missing number in the sequence: 12, 13, ____, 15, 16.
6. Find the missing number in the sequence: 11, 16, ____, 26, 31.
7. Find the missing number in the sequence: 10, 11, ____, 13, 14.
8. Find the missing number in the sequence: 9, 14, ____, 24, 29.
9. Find the missing number in the sequence: 18, 20, ____, 24, 26.
10. Find the missing number in the sequence: 15, 20, ____, 30, 35.
11. Find the missing number in the sequence: 9, 10, ____, 12, 13.
12. Find the missing number in the sequence: 7, 12, ____, 22, 27.
12 questions · Seed 104753 · 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: 19, 20, ____, 22, 23.
21The sequence increases by 1 each step: 20 + 1 = 21.
2. Find the missing number in the sequence: 15, 17, ____, 21, 23.
19The sequence increases by 2 each step: 17 + 2 = 19.
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: 6, 7, ____, 9, 10.
8The sequence increases by 1 each step: 7 + 1 = 8.
5. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
6. Find the missing number in the sequence: 11, 16, ____, 26, 31.
21The sequence increases by 5 each step: 16 + 5 = 21.
7. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
8. Find the missing number in the sequence: 9, 14, ____, 24, 29.
19The sequence increases by 5 each step: 14 + 5 = 19.
9. Find the missing number in the sequence: 18, 20, ____, 24, 26.
22The sequence increases by 2 each step: 20 + 2 = 22.
10. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
11. Find the missing number in the sequence: 9, 10, ____, 12, 13.
11The sequence increases by 1 each step: 10 + 1 = 11.
12. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
12 questions · Seed 104753 · Age guidance, not curriculum certification