Back to worksheetsReasoningAges 7-9
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: 10, 16, ____, 28, 34.
2. Find the missing number in the sequence: 1, 4, ____, 10, 13.
3. Find the missing number in the sequence: 6, 13, ____, 27, 34.
4. Find the missing number in the sequence: 16, 25, ____, 43, 52.
5. Find the missing number in the sequence: 18, 25, ____, 39, 46.
6. Find the missing number in the sequence: 8, 11, ____, 17, 20.
7. Find the missing number in the sequence: 13, 16, ____, 22, 25.
8. Find the missing number in the sequence: 10, 19, ____, 37, 46.
9. Find the missing number in the sequence: 14, 24, ____, 44, 54.
10. Find the missing number in the sequence: 16, 20, ____, 28, 32.
11. Find the missing number in the sequence: 18, 21, ____, 27, 30.
12. Find the missing number in the sequence: 10, 18, ____, 34, 42.
12 questions · Seed 100 · 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: 10, 16, ____, 28, 34.
22The sequence increases by 6 each step: 16 + 6 = 22.
2. Find the missing number in the sequence: 1, 4, ____, 10, 13.
7The sequence increases by 3 each step: 4 + 3 = 7.
3. Find the missing number in the sequence: 6, 13, ____, 27, 34.
20The sequence increases by 7 each step: 13 + 7 = 20.
4. Find the missing number in the sequence: 16, 25, ____, 43, 52.
34The sequence increases by 9 each step: 25 + 9 = 34.
5. Find the missing number in the sequence: 18, 25, ____, 39, 46.
32The sequence increases by 7 each step: 25 + 7 = 32.
6. Find the missing number in the sequence: 8, 11, ____, 17, 20.
14The sequence increases by 3 each step: 11 + 3 = 14.
7. Find the missing number in the sequence: 13, 16, ____, 22, 25.
19The sequence increases by 3 each step: 16 + 3 = 19.
8. Find the missing number in the sequence: 10, 19, ____, 37, 46.
28The sequence increases by 9 each step: 19 + 9 = 28.
9. Find the missing number in the sequence: 14, 24, ____, 44, 54.
34The sequence increases by 10 each step: 24 + 10 = 34.
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: 18, 21, ____, 27, 30.
24The sequence increases by 3 each step: 21 + 3 = 24.
12. Find the missing number in the sequence: 10, 18, ____, 34, 42.
26The sequence increases by 8 each step: 18 + 8 = 26.
12 questions · Seed 100 · 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: 10, 16, ____, 28, 34.
2. Find the missing number in the sequence: 1, 4, ____, 10, 13.
3. Find the missing number in the sequence: 6, 13, ____, 27, 34.
4. Find the missing number in the sequence: 16, 25, ____, 43, 52.
5. Find the missing number in the sequence: 18, 25, ____, 39, 46.
6. Find the missing number in the sequence: 8, 11, ____, 17, 20.
7. Find the missing number in the sequence: 13, 16, ____, 22, 25.
8. Find the missing number in the sequence: 10, 19, ____, 37, 46.
9. Find the missing number in the sequence: 14, 24, ____, 44, 54.
10. Find the missing number in the sequence: 16, 20, ____, 28, 32.
11. Find the missing number in the sequence: 18, 21, ____, 27, 30.
12. Find the missing number in the sequence: 10, 18, ____, 34, 42.
12 questions · Seed 100 · 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: 10, 16, ____, 28, 34.
22The sequence increases by 6 each step: 16 + 6 = 22.
2. Find the missing number in the sequence: 1, 4, ____, 10, 13.
7The sequence increases by 3 each step: 4 + 3 = 7.
3. Find the missing number in the sequence: 6, 13, ____, 27, 34.
20The sequence increases by 7 each step: 13 + 7 = 20.
4. Find the missing number in the sequence: 16, 25, ____, 43, 52.
34The sequence increases by 9 each step: 25 + 9 = 34.
5. Find the missing number in the sequence: 18, 25, ____, 39, 46.
32The sequence increases by 7 each step: 25 + 7 = 32.
6. Find the missing number in the sequence: 8, 11, ____, 17, 20.
14The sequence increases by 3 each step: 11 + 3 = 14.
7. Find the missing number in the sequence: 13, 16, ____, 22, 25.
19The sequence increases by 3 each step: 16 + 3 = 19.
8. Find the missing number in the sequence: 10, 19, ____, 37, 46.
28The sequence increases by 9 each step: 19 + 9 = 28.
9. Find the missing number in the sequence: 14, 24, ____, 44, 54.
34The sequence increases by 10 each step: 24 + 10 = 34.
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: 18, 21, ____, 27, 30.
24The sequence increases by 3 each step: 21 + 3 = 24.
12. Find the missing number in the sequence: 10, 18, ____, 34, 42.
26The sequence increases by 8 each step: 18 + 8 = 26.
12 questions · Seed 100 · Age guidance, not curriculum certification