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: 9, 16, ____, 30, 37.
2. Find the missing number in the sequence: 4, 13, ____, 31, 40.
3. Find the missing number in the sequence: 12, 22, ____, 42, 52.
4. Find the missing number in the sequence: 6, 12, ____, 24, 30.
5. Find the missing number in the sequence: 5, 12, ____, 26, 33.
6. Find the missing number in the sequence: 19, 23, ____, 31, 35.
7. Find the missing number in the sequence: 16, 19, ____, 25, 28.
8. Find the missing number in the sequence: 19, 26, ____, 40, 47.
9. Find the missing number in the sequence: 3, 13, ____, 33, 43.
10. Find the missing number in the sequence: 15, 19, ____, 27, 31.
11. Find the missing number in the sequence: 7, 11, ____, 19, 23.
12. Find the missing number in the sequence: 13, 19, ____, 31, 37.
12 questions · Seed 78 · 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: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
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: 12, 22, ____, 42, 52.
32The sequence increases by 10 each step: 22 + 10 = 32.
4. Find the missing number in the sequence: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
5. Find the missing number in the sequence: 5, 12, ____, 26, 33.
19The sequence increases by 7 each step: 12 + 7 = 19.
6. Find the missing number in the sequence: 19, 23, ____, 31, 35.
27The sequence increases by 4 each step: 23 + 4 = 27.
7. Find the missing number in the sequence: 16, 19, ____, 25, 28.
22The sequence increases by 3 each step: 19 + 3 = 22.
8. Find the missing number in the sequence: 19, 26, ____, 40, 47.
33The sequence increases by 7 each step: 26 + 7 = 33.
9. Find the missing number in the sequence: 3, 13, ____, 33, 43.
23The sequence increases by 10 each step: 13 + 10 = 23.
10. Find the missing number in the sequence: 15, 19, ____, 27, 31.
23The sequence increases by 4 each step: 19 + 4 = 23.
11. Find the missing number in the sequence: 7, 11, ____, 19, 23.
15The sequence increases by 4 each step: 11 + 4 = 15.
12. Find the missing number in the sequence: 13, 19, ____, 31, 37.
25The sequence increases by 6 each step: 19 + 6 = 25.
12 questions · Seed 78 · 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: 9, 16, ____, 30, 37.
2. Find the missing number in the sequence: 4, 13, ____, 31, 40.
3. Find the missing number in the sequence: 12, 22, ____, 42, 52.
4. Find the missing number in the sequence: 6, 12, ____, 24, 30.
5. Find the missing number in the sequence: 5, 12, ____, 26, 33.
6. Find the missing number in the sequence: 19, 23, ____, 31, 35.
7. Find the missing number in the sequence: 16, 19, ____, 25, 28.
8. Find the missing number in the sequence: 19, 26, ____, 40, 47.
9. Find the missing number in the sequence: 3, 13, ____, 33, 43.
10. Find the missing number in the sequence: 15, 19, ____, 27, 31.
11. Find the missing number in the sequence: 7, 11, ____, 19, 23.
12. Find the missing number in the sequence: 13, 19, ____, 31, 37.
12 questions · Seed 78 · 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: 9, 16, ____, 30, 37.
23The sequence increases by 7 each step: 16 + 7 = 23.
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: 12, 22, ____, 42, 52.
32The sequence increases by 10 each step: 22 + 10 = 32.
4. Find the missing number in the sequence: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
5. Find the missing number in the sequence: 5, 12, ____, 26, 33.
19The sequence increases by 7 each step: 12 + 7 = 19.
6. Find the missing number in the sequence: 19, 23, ____, 31, 35.
27The sequence increases by 4 each step: 23 + 4 = 27.
7. Find the missing number in the sequence: 16, 19, ____, 25, 28.
22The sequence increases by 3 each step: 19 + 3 = 22.
8. Find the missing number in the sequence: 19, 26, ____, 40, 47.
33The sequence increases by 7 each step: 26 + 7 = 33.
9. Find the missing number in the sequence: 3, 13, ____, 33, 43.
23The sequence increases by 10 each step: 13 + 10 = 23.
10. Find the missing number in the sequence: 15, 19, ____, 27, 31.
23The sequence increases by 4 each step: 19 + 4 = 23.
11. Find the missing number in the sequence: 7, 11, ____, 19, 23.
15The sequence increases by 4 each step: 11 + 4 = 15.
12. Find the missing number in the sequence: 13, 19, ____, 31, 37.
25The sequence increases by 6 each step: 19 + 6 = 25.
12 questions · Seed 78 · Age guidance, not curriculum certification