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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: 6, 16, ____, 36, 46.
2. Find the missing number in the sequence: 4, 13, ____, 31, 40.
3. Find the missing number in the sequence: 16, 26, ____, 46, 56.
4. Find the missing number in the sequence: 10, 20, ____, 40, 50.
5. Find the missing number in the sequence: 15, 19, ____, 27, 31.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
7. Find the missing number in the sequence: 5, 15, ____, 35, 45.
8. Find the missing number in the sequence: 16, 25, ____, 43, 52.
9. Find the missing number in the sequence: 14, 17, ____, 23, 26.
10. Find the missing number in the sequence: 16, 23, ____, 37, 44.
11. Find the missing number in the sequence: 6, 12, ____, 24, 30.
12. Find the missing number in the sequence: 7, 14, ____, 28, 35.
12 questions · Seed 54 · 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: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
2. Find the missing number in the sequence: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
3. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
4. Find the missing number in the sequence: 10, 20, ____, 40, 50.
30The sequence increases by 10 each step: 20 + 10 = 30.
5. Find the missing number in the sequence: 15, 19, ____, 27, 31.
23The sequence increases by 4 each step: 19 + 4 = 23.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
7. Find the missing number in the sequence: 5, 15, ____, 35, 45.
25The sequence increases by 10 each step: 15 + 10 = 25.
8. Find the missing number in the sequence: 16, 25, ____, 43, 52.
34The sequence increases by 9 each step: 25 + 9 = 34.
9. Find the missing number in the sequence: 14, 17, ____, 23, 26.
20The sequence increases by 3 each step: 17 + 3 = 20.
10. Find the missing number in the sequence: 16, 23, ____, 37, 44.
30The sequence increases by 7 each step: 23 + 7 = 30.
11. Find the missing number in the sequence: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
12. Find the missing number in the sequence: 7, 14, ____, 28, 35.
21The sequence increases by 7 each step: 14 + 7 = 21.
12 questions · Seed 54 · 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: 6, 16, ____, 36, 46.
2. Find the missing number in the sequence: 4, 13, ____, 31, 40.
3. Find the missing number in the sequence: 16, 26, ____, 46, 56.
4. Find the missing number in the sequence: 10, 20, ____, 40, 50.
5. Find the missing number in the sequence: 15, 19, ____, 27, 31.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
7. Find the missing number in the sequence: 5, 15, ____, 35, 45.
8. Find the missing number in the sequence: 16, 25, ____, 43, 52.
9. Find the missing number in the sequence: 14, 17, ____, 23, 26.
10. Find the missing number in the sequence: 16, 23, ____, 37, 44.
11. Find the missing number in the sequence: 6, 12, ____, 24, 30.
12. Find the missing number in the sequence: 7, 14, ____, 28, 35.
12 questions · Seed 54 · 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: 6, 16, ____, 36, 46.
26The sequence increases by 10 each step: 16 + 10 = 26.
2. Find the missing number in the sequence: 4, 13, ____, 31, 40.
22The sequence increases by 9 each step: 13 + 9 = 22.
3. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
4. Find the missing number in the sequence: 10, 20, ____, 40, 50.
30The sequence increases by 10 each step: 20 + 10 = 30.
5. Find the missing number in the sequence: 15, 19, ____, 27, 31.
23The sequence increases by 4 each step: 19 + 4 = 23.
6. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
7. Find the missing number in the sequence: 5, 15, ____, 35, 45.
25The sequence increases by 10 each step: 15 + 10 = 25.
8. Find the missing number in the sequence: 16, 25, ____, 43, 52.
34The sequence increases by 9 each step: 25 + 9 = 34.
9. Find the missing number in the sequence: 14, 17, ____, 23, 26.
20The sequence increases by 3 each step: 17 + 3 = 20.
10. Find the missing number in the sequence: 16, 23, ____, 37, 44.
30The sequence increases by 7 each step: 23 + 7 = 30.
11. Find the missing number in the sequence: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
12. Find the missing number in the sequence: 7, 14, ____, 28, 35.
21The sequence increases by 7 each step: 14 + 7 = 21.
12 questions · Seed 54 · Age guidance, not curriculum certification