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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: 1, 5, ____, 13, 17.
2. Find the missing number in the sequence: 16, 24, ____, 40, 48.
3. Find the missing number in the sequence: 7, 14, ____, 28, 35.
4. Find the missing number in the sequence: 13, 16, ____, 22, 25.
5. Find the missing number in the sequence: 16, 26, ____, 46, 56.
6. Find the missing number in the sequence: 1, 7, ____, 19, 25.
7. Find the missing number in the sequence: 7, 11, ____, 19, 23.
8. Find the missing number in the sequence: 14, 21, ____, 35, 42.
9. Find the missing number in the sequence: 19, 23, ____, 31, 35.
10. Find the missing number in the sequence: 2, 5, ____, 11, 14.
11. Find the missing number in the sequence: 5, 9, ____, 17, 21.
12. Find the missing number in the sequence: 17, 21, ____, 29, 33.
12 questions · Seed 104731 · 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: 1, 5, ____, 13, 17.
9The sequence increases by 4 each step: 5 + 4 = 9.
2. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
3. Find the missing number in the sequence: 7, 14, ____, 28, 35.
21The sequence increases by 7 each step: 14 + 7 = 21.
4. Find the missing number in the sequence: 13, 16, ____, 22, 25.
19The sequence increases by 3 each step: 16 + 3 = 19.
5. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
6. Find the missing number in the sequence: 1, 7, ____, 19, 25.
13The sequence increases by 6 each step: 7 + 6 = 13.
7. Find the missing number in the sequence: 7, 11, ____, 19, 23.
15The sequence increases by 4 each step: 11 + 4 = 15.
8. Find the missing number in the sequence: 14, 21, ____, 35, 42.
28The sequence increases by 7 each step: 21 + 7 = 28.
9. Find the missing number in the sequence: 19, 23, ____, 31, 35.
27The sequence increases by 4 each step: 23 + 4 = 27.
10. Find the missing number in the sequence: 2, 5, ____, 11, 14.
8The sequence increases by 3 each step: 5 + 3 = 8.
11. Find the missing number in the sequence: 5, 9, ____, 17, 21.
13The sequence increases by 4 each step: 9 + 4 = 13.
12. Find the missing number in the sequence: 17, 21, ____, 29, 33.
25The sequence increases by 4 each step: 21 + 4 = 25.
12 questions · Seed 104731 · 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: 1, 5, ____, 13, 17.
2. Find the missing number in the sequence: 16, 24, ____, 40, 48.
3. Find the missing number in the sequence: 7, 14, ____, 28, 35.
4. Find the missing number in the sequence: 13, 16, ____, 22, 25.
5. Find the missing number in the sequence: 16, 26, ____, 46, 56.
6. Find the missing number in the sequence: 1, 7, ____, 19, 25.
7. Find the missing number in the sequence: 7, 11, ____, 19, 23.
8. Find the missing number in the sequence: 14, 21, ____, 35, 42.
9. Find the missing number in the sequence: 19, 23, ____, 31, 35.
10. Find the missing number in the sequence: 2, 5, ____, 11, 14.
11. Find the missing number in the sequence: 5, 9, ____, 17, 21.
12. Find the missing number in the sequence: 17, 21, ____, 29, 33.
12 questions · Seed 104731 · 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: 1, 5, ____, 13, 17.
9The sequence increases by 4 each step: 5 + 4 = 9.
2. Find the missing number in the sequence: 16, 24, ____, 40, 48.
32The sequence increases by 8 each step: 24 + 8 = 32.
3. Find the missing number in the sequence: 7, 14, ____, 28, 35.
21The sequence increases by 7 each step: 14 + 7 = 21.
4. Find the missing number in the sequence: 13, 16, ____, 22, 25.
19The sequence increases by 3 each step: 16 + 3 = 19.
5. Find the missing number in the sequence: 16, 26, ____, 46, 56.
36The sequence increases by 10 each step: 26 + 10 = 36.
6. Find the missing number in the sequence: 1, 7, ____, 19, 25.
13The sequence increases by 6 each step: 7 + 6 = 13.
7. Find the missing number in the sequence: 7, 11, ____, 19, 23.
15The sequence increases by 4 each step: 11 + 4 = 15.
8. Find the missing number in the sequence: 14, 21, ____, 35, 42.
28The sequence increases by 7 each step: 21 + 7 = 28.
9. Find the missing number in the sequence: 19, 23, ____, 31, 35.
27The sequence increases by 4 each step: 23 + 4 = 27.
10. Find the missing number in the sequence: 2, 5, ____, 11, 14.
8The sequence increases by 3 each step: 5 + 3 = 8.
11. Find the missing number in the sequence: 5, 9, ____, 17, 21.
13The sequence increases by 4 each step: 9 + 4 = 13.
12. Find the missing number in the sequence: 17, 21, ____, 29, 33.
25The sequence increases by 4 each step: 21 + 4 = 25.
12 questions · Seed 104731 · Age guidance, not curriculum certification