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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: 17, 18, ____, 20, 21.
2. Find the missing number in the sequence: 11, 12, ____, 14, 15.
3. Find the missing number in the sequence: 14, 15, ____, 17, 18.
4. Find the missing number in the sequence: 13, 15, ____, 19, 21.
5. Find the missing number in the sequence: 16, 18, ____, 22, 24.
6. Find the missing number in the sequence: 6, 11, ____, 21, 26.
7. Find the missing number in the sequence: 18, 19, ____, 21, 22.
8. Find the missing number in the sequence: 20, 21, ____, 23, 24.
9. Find the missing number in the sequence: 2, 7, ____, 17, 22.
10. Find the missing number in the sequence: 8, 13, ____, 23, 28.
11. Find the missing number in the sequence: 3, 8, ____, 18, 23.
12. Find the missing number in the sequence: 12, 13, ____, 15, 16.
12 questions · Seed 104757 · 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: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
2. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
3. Find the missing number in the sequence: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
4. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
5. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
6. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16The sequence increases by 5 each step: 11 + 5 = 16.
7. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
8. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
9. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
10. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
11. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
12. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
12 questions · Seed 104757 · 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: 17, 18, ____, 20, 21.
2. Find the missing number in the sequence: 11, 12, ____, 14, 15.
3. Find the missing number in the sequence: 14, 15, ____, 17, 18.
4. Find the missing number in the sequence: 13, 15, ____, 19, 21.
5. Find the missing number in the sequence: 16, 18, ____, 22, 24.
6. Find the missing number in the sequence: 6, 11, ____, 21, 26.
7. Find the missing number in the sequence: 18, 19, ____, 21, 22.
8. Find the missing number in the sequence: 20, 21, ____, 23, 24.
9. Find the missing number in the sequence: 2, 7, ____, 17, 22.
10. Find the missing number in the sequence: 8, 13, ____, 23, 28.
11. Find the missing number in the sequence: 3, 8, ____, 18, 23.
12. Find the missing number in the sequence: 12, 13, ____, 15, 16.
12 questions · Seed 104757 · 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: 17, 18, ____, 20, 21.
19The sequence increases by 1 each step: 18 + 1 = 19.
2. Find the missing number in the sequence: 11, 12, ____, 14, 15.
13The sequence increases by 1 each step: 12 + 1 = 13.
3. Find the missing number in the sequence: 14, 15, ____, 17, 18.
16The sequence increases by 1 each step: 15 + 1 = 16.
4. Find the missing number in the sequence: 13, 15, ____, 19, 21.
17The sequence increases by 2 each step: 15 + 2 = 17.
5. Find the missing number in the sequence: 16, 18, ____, 22, 24.
20The sequence increases by 2 each step: 18 + 2 = 20.
6. Find the missing number in the sequence: 6, 11, ____, 21, 26.
16The sequence increases by 5 each step: 11 + 5 = 16.
7. Find the missing number in the sequence: 18, 19, ____, 21, 22.
20The sequence increases by 1 each step: 19 + 1 = 20.
8. Find the missing number in the sequence: 20, 21, ____, 23, 24.
22The sequence increases by 1 each step: 21 + 1 = 22.
9. Find the missing number in the sequence: 2, 7, ____, 17, 22.
12The sequence increases by 5 each step: 7 + 5 = 12.
10. Find the missing number in the sequence: 8, 13, ____, 23, 28.
18The sequence increases by 5 each step: 13 + 5 = 18.
11. Find the missing number in the sequence: 3, 8, ____, 18, 23.
13The sequence increases by 5 each step: 8 + 5 = 13.
12. Find the missing number in the sequence: 12, 13, ____, 15, 16.
14The sequence increases by 1 each step: 13 + 1 = 14.
12 questions · Seed 104757 · Age guidance, not curriculum certification