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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: 6, 11, ____, 21, 26.
2. Find the missing number in the sequence: 2, 3, ____, 5, 6.
3. Find the missing number in the sequence: 10, 11, ____, 13, 14.
4. Find the missing number in the sequence: 20, 21, ____, 23, 24.
5. Find the missing number in the sequence: 15, 16, ____, 18, 19.
6. Find the missing number in the sequence: 17, 19, ____, 23, 25.
7. Find the missing number in the sequence: 17, 18, ____, 20, 21.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
9. Find the missing number in the sequence: 1, 3, ____, 7, 9.
10. Find the missing number in the sequence: 19, 24, ____, 34, 39.
11. Find the missing number in the sequence: 11, 12, ____, 14, 15.
12. Find the missing number in the sequence: 20, 22, ____, 26, 28.
12 questions · Seed 84 · 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: 6, 11, ____, 21, 26.
16The sequence increases by 5 each step: 11 + 5 = 16.
2. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4The sequence increases by 1 each step: 3 + 1 = 4.
3. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
4. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
5. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
6. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
7. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
9. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
10. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
11. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
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 84 · 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: 6, 11, ____, 21, 26.
2. Find the missing number in the sequence: 2, 3, ____, 5, 6.
3. Find the missing number in the sequence: 10, 11, ____, 13, 14.
4. Find the missing number in the sequence: 20, 21, ____, 23, 24.
5. Find the missing number in the sequence: 15, 16, ____, 18, 19.
6. Find the missing number in the sequence: 17, 19, ____, 23, 25.
7. Find the missing number in the sequence: 17, 18, ____, 20, 21.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
9. Find the missing number in the sequence: 1, 3, ____, 7, 9.
10. Find the missing number in the sequence: 19, 24, ____, 34, 39.
11. Find the missing number in the sequence: 11, 12, ____, 14, 15.
12. Find the missing number in the sequence: 20, 22, ____, 26, 28.
12 questions · Seed 84 · 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: 6, 11, ____, 21, 26.
16The sequence increases by 5 each step: 11 + 5 = 16.
2. Find the missing number in the sequence: 2, 3, ____, 5, 6.
4The sequence increases by 1 each step: 3 + 1 = 4.
3. Find the missing number in the sequence: 10, 11, ____, 13, 14.
12The sequence increases by 1 each step: 11 + 1 = 12.
4. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
5. Find the missing number in the sequence: 15, 16, ____, 18, 19.
17The sequence increases by 1 each step: 16 + 1 = 17.
6. Find the missing number in the sequence: 17, 19, ____, 23, 25.
21The sequence increases by 2 each step: 19 + 2 = 21.
7. Find the missing number in the sequence: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
8. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
9. Find the missing number in the sequence: 1, 3, ____, 7, 9.
5The sequence increases by 2 each step: 3 + 2 = 5.
10. Find the missing number in the sequence: 19, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
11. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
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 84 · Age guidance, not curriculum certification