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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: 4, 9, ____, 19, 24.
3. Find the missing number in the sequence: 16, 21, ____, 31, 36.
4. Find the missing number in the sequence: 10, 15, ____, 25, 30.
5. Find the missing number in the sequence: 15, 16, ____, 18, 19.
6. Find the missing number in the sequence: 16, 18, ____, 22, 24.
7. Find the missing number in the sequence: 5, 10, ____, 20, 25.
8. Find the missing number in the sequence: 14, 15, ____, 17, 18.
9. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10. Find the missing number in the sequence: 7, 9, ____, 13, 15.
11. Find the missing number in the sequence: 12, 17, ____, 27, 32.
12. Find the missing number in the sequence: 3, 4, ____, 6, 7.
12 questions · Seed 54 · 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: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
3. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
4. Find the missing number in the sequence: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
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: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
7. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
8. Find the missing number in the sequence: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
9. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
10. Find the missing number in the sequence: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
11. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22The sequence increases by 5 each step: 17 + 5 = 22.
12. Find the missing number in the sequence: 3, 4, ____, 6, 7.
5The sequence increases by 1 each step: 4 + 1 = 5.
12 questions · Seed 54 · 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: 4, 9, ____, 19, 24.
3. Find the missing number in the sequence: 16, 21, ____, 31, 36.
4. Find the missing number in the sequence: 10, 15, ____, 25, 30.
5. Find the missing number in the sequence: 15, 16, ____, 18, 19.
6. Find the missing number in the sequence: 16, 18, ____, 22, 24.
7. Find the missing number in the sequence: 5, 10, ____, 20, 25.
8. Find the missing number in the sequence: 14, 15, ____, 17, 18.
9. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10. Find the missing number in the sequence: 7, 9, ____, 13, 15.
11. Find the missing number in the sequence: 12, 17, ____, 27, 32.
12. Find the missing number in the sequence: 3, 4, ____, 6, 7.
12 questions · Seed 54 · 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: 4, 9, ____, 19, 24.
14The sequence increases by 5 each step: 9 + 5 = 14.
3. Find the missing number in the sequence: 16, 21, ____, 31, 36.
26The sequence increases by 5 each step: 21 + 5 = 26.
4. Find the missing number in the sequence: 10, 15, ____, 25, 30.
20The sequence increases by 5 each step: 15 + 5 = 20.
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: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
7. Find the missing number in the sequence: 5, 10, ____, 20, 25.
15The sequence increases by 5 each step: 10 + 5 = 15.
8. Find the missing number in the sequence: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
9. Find the missing number in the sequence: 6, 8, ____, 12, 14.
10The sequence increases by 2 each step: 8 + 2 = 10.
10. Find the missing number in the sequence: 7, 9, ____, 13, 15.
11The sequence increases by 2 each step: 9 + 2 = 11.
11. Find the missing number in the sequence: 12, 17, ____, 27, 32.
22The sequence increases by 5 each step: 17 + 5 = 22.
12. Find the missing number in the sequence: 3, 4, ____, 6, 7.
5The sequence increases by 1 each step: 4 + 1 = 5.
12 questions · Seed 54 · Age guidance, not curriculum certification