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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 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 19, 22, ____, 28, 31.
2. Find the missing number in the sequence: 4, 7, ____, 13, 16.
3. Find the missing number in the sequence: 12, 15, ____, 21, 24.
4. Find the missing number in the sequence: 20, 30, ____, 50, 60.
5. Find the missing number in the sequence: 20, 23, ____, 29, 32.
6. Find the missing number in the sequence: 2, 10, ____, 26, 34.
7. Find the missing number in the sequence: 18, 24, ____, 36, 42.
8. Find the missing number in the sequence: 16, 26, ____, 46, 56.
9. Find the missing number in the sequence: 9, 16, ____, 30, 37.
10. Find the missing number in the sequence: 16, 20, ____, 28, 32.
11. Find the missing number in the sequence: 4, 13, ____, 31, 40.
12. Find the missing number in the sequence: 14, 18, ____, 26, 30.
12 questions · Seed 51 · Age guidance, not curriculum certification
View the answer key
Worksheet StudioAnswer key · Ages 7-9
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 19, 22, ____, 28, 31.
25The sequence increases by 3 each step: 22 + 3 = 25.
2. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
3. Find the missing number in the sequence: 12, 15, ____, 21, 24.
18The sequence increases by 3 each step: 15 + 3 = 18.
4. Find the missing number in the sequence: 20, 30, ____, 50, 60.
40The sequence increases by 10 each step: 30 + 10 = 40.
5. Find the missing number in the sequence: 20, 23, ____, 29, 32.
26The sequence increases by 3 each step: 23 + 3 = 26.
6. Find the missing number in the sequence: 2, 10, ____, 26, 34.
18The sequence increases by 8 each step: 10 + 8 = 18.
7. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
8. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
9. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
10. Find the missing number in the sequence: 16, 20, ____, 28, 32.
24The sequence increases by 4 each step: 20 + 4 = 24.
11. Find the missing number in the sequence: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
12. Find the missing number in the sequence: 14, 18, ____, 26, 30.
22The sequence increases by 4 each step: 18 + 4 = 22.
12 questions · Seed 51 · Age guidance, not curriculum certification
Worksheet StudioPractice pack · Ages 7-9
Missing sequence terms
Take your time. Show your thinking.
1. Find the missing number in the sequence: 19, 22, ____, 28, 31.
2. Find the missing number in the sequence: 4, 7, ____, 13, 16.
3. Find the missing number in the sequence: 12, 15, ____, 21, 24.
4. Find the missing number in the sequence: 20, 30, ____, 50, 60.
5. Find the missing number in the sequence: 20, 23, ____, 29, 32.
6. Find the missing number in the sequence: 2, 10, ____, 26, 34.
7. Find the missing number in the sequence: 18, 24, ____, 36, 42.
8. Find the missing number in the sequence: 16, 26, ____, 46, 56.
9. Find the missing number in the sequence: 9, 16, ____, 30, 37.
10. Find the missing number in the sequence: 16, 20, ____, 28, 32.
11. Find the missing number in the sequence: 4, 13, ____, 31, 40.
12. Find the missing number in the sequence: 14, 18, ____, 26, 30.
12 questions · Seed 51 · Age guidance, not curriculum certification
Worksheet StudioAnswer key · Ages 7-9
Missing sequence terms
Answers and reasoning. Review before teaching.
1. Find the missing number in the sequence: 19, 22, ____, 28, 31.
25The sequence increases by 3 each step: 22 + 3 = 25.
2. Find the missing number in the sequence: 4, 7, ____, 13, 16.
10The sequence increases by 3 each step: 7 + 3 = 10.
3. Find the missing number in the sequence: 12, 15, ____, 21, 24.
18The sequence increases by 3 each step: 15 + 3 = 18.
4. Find the missing number in the sequence: 20, 30, ____, 50, 60.
40The sequence increases by 10 each step: 30 + 10 = 40.
5. Find the missing number in the sequence: 20, 23, ____, 29, 32.
26The sequence increases by 3 each step: 23 + 3 = 26.
6. Find the missing number in the sequence: 2, 10, ____, 26, 34.
18The sequence increases by 8 each step: 10 + 8 = 18.
7. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
8. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
9. Find the missing number in the sequence: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
10. Find the missing number in the sequence: 16, 20, ____, 28, 32.
24The sequence increases by 4 each step: 20 + 4 = 24.
11. Find the missing number in the sequence: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
12. Find the missing number in the sequence: 14, 18, ____, 26, 30.
22The sequence increases by 4 each step: 18 + 4 = 22.
12 questions · Seed 51 · Age guidance, not curriculum certification