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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: 14, 23, ____, 41, 50.
2. Find the missing number in the sequence: 19, 22, ____, 28, 31.
3. Find the missing number in the sequence: 6, 12, ____, 24, 30.
4. Find the missing number in the sequence: 18, 25, ____, 39, 46.
5. Find the missing number in the sequence: 2, 8, ____, 20, 26.
6. Find the missing number in the sequence: 10, 16, ____, 28, 34.
7. Find the missing number in the sequence: 20, 26, ____, 38, 44.
8. Find the missing number in the sequence: 15, 24, ____, 42, 51.
9. Find the missing number in the sequence: 18, 24, ____, 36, 42.
10. Find the missing number in the sequence: 17, 26, ____, 44, 53.
11. Find the missing number in the sequence: 15, 21, ____, 33, 39.
12. Find the missing number in the sequence: 19, 27, ____, 43, 51.
12 questions · Seed 87 · 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: 14, 23, ____, 41, 50.
32The sequence increases by 9 each step: 23 + 9 = 32.
2. Find the missing number in the sequence: 19, 22, ____, 28, 31.
25The sequence increases by 3 each step: 22 + 3 = 25.
3. Find the missing number in the sequence: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
4. Find the missing number in the sequence: 18, 25, ____, 39, 46.
32The sequence increases by 7 each step: 25 + 7 = 32.
5. Find the missing number in the sequence: 2, 8, ____, 20, 26.
14The sequence increases by 6 each step: 8 + 6 = 14.
6. Find the missing number in the sequence: 10, 16, ____, 28, 34.
22The sequence increases by 6 each step: 16 + 6 = 22.
7. Find the missing number in the sequence: 20, 26, ____, 38, 44.
32The sequence increases by 6 each step: 26 + 6 = 32.
8. Find the missing number in the sequence: 15, 24, ____, 42, 51.
33The sequence increases by 9 each step: 24 + 9 = 33.
9. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
10. Find the missing number in the sequence: 17, 26, ____, 44, 53.
35The sequence increases by 9 each step: 26 + 9 = 35.
11. Find the missing number in the sequence: 15, 21, ____, 33, 39.
27The sequence increases by 6 each step: 21 + 6 = 27.
12. Find the missing number in the sequence: 19, 27, ____, 43, 51.
35The sequence increases by 8 each step: 27 + 8 = 35.
12 questions · Seed 87 · 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: 14, 23, ____, 41, 50.
2. Find the missing number in the sequence: 19, 22, ____, 28, 31.
3. Find the missing number in the sequence: 6, 12, ____, 24, 30.
4. Find the missing number in the sequence: 18, 25, ____, 39, 46.
5. Find the missing number in the sequence: 2, 8, ____, 20, 26.
6. Find the missing number in the sequence: 10, 16, ____, 28, 34.
7. Find the missing number in the sequence: 20, 26, ____, 38, 44.
8. Find the missing number in the sequence: 15, 24, ____, 42, 51.
9. Find the missing number in the sequence: 18, 24, ____, 36, 42.
10. Find the missing number in the sequence: 17, 26, ____, 44, 53.
11. Find the missing number in the sequence: 15, 21, ____, 33, 39.
12. Find the missing number in the sequence: 19, 27, ____, 43, 51.
12 questions · Seed 87 · 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: 14, 23, ____, 41, 50.
32The sequence increases by 9 each step: 23 + 9 = 32.
2. Find the missing number in the sequence: 19, 22, ____, 28, 31.
25The sequence increases by 3 each step: 22 + 3 = 25.
3. Find the missing number in the sequence: 6, 12, ____, 24, 30.
18The sequence increases by 6 each step: 12 + 6 = 18.
4. Find the missing number in the sequence: 18, 25, ____, 39, 46.
32The sequence increases by 7 each step: 25 + 7 = 32.
5. Find the missing number in the sequence: 2, 8, ____, 20, 26.
14The sequence increases by 6 each step: 8 + 6 = 14.
6. Find the missing number in the sequence: 10, 16, ____, 28, 34.
22The sequence increases by 6 each step: 16 + 6 = 22.
7. Find the missing number in the sequence: 20, 26, ____, 38, 44.
32The sequence increases by 6 each step: 26 + 6 = 32.
8. Find the missing number in the sequence: 15, 24, ____, 42, 51.
33The sequence increases by 9 each step: 24 + 9 = 33.
9. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
10. Find the missing number in the sequence: 17, 26, ____, 44, 53.
35The sequence increases by 9 each step: 26 + 9 = 35.
11. Find the missing number in the sequence: 15, 21, ____, 33, 39.
27The sequence increases by 6 each step: 21 + 6 = 27.
12. Find the missing number in the sequence: 19, 27, ____, 43, 51.
35The sequence increases by 8 each step: 27 + 8 = 35.
12 questions · Seed 87 · Age guidance, not curriculum certification