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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, 24, ____, 34, 39.
2. Find the missing number in the sequence: 4, 5, ____, 7, 8.
3. Find the missing number in the sequence: 3, 8, ____, 18, 23.
4. Find the missing number in the sequence: 14, 16, ____, 20, 22.
5. Find the missing number in the sequence: 20, 21, ____, 23, 24.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
7. Find the missing number in the sequence: 9, 11, ____, 15, 17.
8. Find the missing number in the sequence: 4, 6, ____, 10, 12.
9. Find the missing number in the sequence: 13, 15, ____, 19, 21.
10. Find the missing number in the sequence: 2, 7, ____, 17, 22.
11. Find the missing number in the sequence: 15, 20, ____, 30, 35.
12. Find the missing number in the sequence: 17, 22, ____, 32, 37.
12 questions · Seed 89 · 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, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
2. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
3. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
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: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
7. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
8. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
9. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
10. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
11. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
12. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
12 questions · Seed 89 · 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, 24, ____, 34, 39.
2. Find the missing number in the sequence: 4, 5, ____, 7, 8.
3. Find the missing number in the sequence: 3, 8, ____, 18, 23.
4. Find the missing number in the sequence: 14, 16, ____, 20, 22.
5. Find the missing number in the sequence: 20, 21, ____, 23, 24.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
7. Find the missing number in the sequence: 9, 11, ____, 15, 17.
8. Find the missing number in the sequence: 4, 6, ____, 10, 12.
9. Find the missing number in the sequence: 13, 15, ____, 19, 21.
10. Find the missing number in the sequence: 2, 7, ____, 17, 22.
11. Find the missing number in the sequence: 15, 20, ____, 30, 35.
12. Find the missing number in the sequence: 17, 22, ____, 32, 37.
12 questions · Seed 89 · 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, 24, ____, 34, 39.
29The sequence increases by 5 each step: 24 + 5 = 29.
2. Find the missing number in the sequence: 4, 5, ____, 7, 8.
6The sequence increases by 1 each step: 5 + 1 = 6.
3. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
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: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
6. Find the missing number in the sequence: 7, 12, ____, 22, 27.
17The sequence increases by 5 each step: 12 + 5 = 17.
7. Find the missing number in the sequence: 9, 11, ____, 15, 17.
13The sequence increases by 2 each step: 11 + 2 = 13.
8. Find the missing number in the sequence: 4, 6, ____, 10, 12.
8The sequence increases by 2 each step: 6 + 2 = 8.
9. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
10. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
11. Find the missing number in the sequence: 15, 20, ____, 30, 35.
25The sequence increases by 5 each step: 20 + 5 = 25.
12. Find the missing number in the sequence: 17, 22, ____, 32, 37.
27The sequence increases by 5 each step: 22 + 5 = 27.
12 questions · Seed 89 · Age guidance, not curriculum certification