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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: 17, 26, ____, 44, 53.
2. Find the missing number in the sequence: 18, 22, ____, 30, 34.
3. Find the missing number in the sequence: 16, 19, ____, 25, 28.
4. Find the missing number in the sequence: 18, 24, ____, 36, 42.
5. Find the missing number in the sequence: 15, 22, ____, 36, 43.
6. Find the missing number in the sequence: 12, 18, ____, 30, 36.
7. Find the missing number in the sequence: 3, 7, ____, 15, 19.
8. Find the missing number in the sequence: 16, 22, ____, 34, 40.
9. Find the missing number in the sequence: 14, 18, ____, 26, 30.
10. Find the missing number in the sequence: 19, 22, ____, 28, 31.
11. Find the missing number in the sequence: 4, 11, ____, 25, 32.
12. Find the missing number in the sequence: 15, 21, ____, 33, 39.
12 questions · Seed 93 · 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: 17, 26, ____, 44, 53.
35The sequence increases by 9 each step: 26 + 9 = 35.
2. Find the missing number in the sequence: 18, 22, ____, 30, 34.
26The sequence increases by 4 each step: 22 + 4 = 26.
3. Find the missing number in the sequence: 16, 19, ____, 25, 28.
22The sequence increases by 3 each step: 19 + 3 = 22.
4. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
5. Find the missing number in the sequence: 15, 22, ____, 36, 43.
29The sequence increases by 7 each step: 22 + 7 = 29.
6. Find the missing number in the sequence: 12, 18, ____, 30, 36.
24The sequence increases by 6 each step: 18 + 6 = 24.
7. Find the missing number in the sequence: 3, 7, ____, 15, 19.
11The sequence increases by 4 each step: 7 + 4 = 11.
8. Find the missing number in the sequence: 16, 22, ____, 34, 40.
28The sequence increases by 6 each step: 22 + 6 = 28.
9. Find the missing number in the sequence: 14, 18, ____, 26, 30.
22The sequence increases by 4 each step: 18 + 4 = 22.
10. Find the missing number in the sequence: 19, 22, ____, 28, 31.
25The sequence increases by 3 each step: 22 + 3 = 25.
11. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
12. Find the missing number in the sequence: 15, 21, ____, 33, 39.
27The sequence increases by 6 each step: 21 + 6 = 27.
12 questions · Seed 93 · 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: 17, 26, ____, 44, 53.
2. Find the missing number in the sequence: 18, 22, ____, 30, 34.
3. Find the missing number in the sequence: 16, 19, ____, 25, 28.
4. Find the missing number in the sequence: 18, 24, ____, 36, 42.
5. Find the missing number in the sequence: 15, 22, ____, 36, 43.
6. Find the missing number in the sequence: 12, 18, ____, 30, 36.
7. Find the missing number in the sequence: 3, 7, ____, 15, 19.
8. Find the missing number in the sequence: 16, 22, ____, 34, 40.
9. Find the missing number in the sequence: 14, 18, ____, 26, 30.
10. Find the missing number in the sequence: 19, 22, ____, 28, 31.
11. Find the missing number in the sequence: 4, 11, ____, 25, 32.
12. Find the missing number in the sequence: 15, 21, ____, 33, 39.
12 questions · Seed 93 · 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: 17, 26, ____, 44, 53.
35The sequence increases by 9 each step: 26 + 9 = 35.
2. Find the missing number in the sequence: 18, 22, ____, 30, 34.
26The sequence increases by 4 each step: 22 + 4 = 26.
3. Find the missing number in the sequence: 16, 19, ____, 25, 28.
22The sequence increases by 3 each step: 19 + 3 = 22.
4. Find the missing number in the sequence: 18, 24, ____, 36, 42.
30The sequence increases by 6 each step: 24 + 6 = 30.
5. Find the missing number in the sequence: 15, 22, ____, 36, 43.
29The sequence increases by 7 each step: 22 + 7 = 29.
6. Find the missing number in the sequence: 12, 18, ____, 30, 36.
24The sequence increases by 6 each step: 18 + 6 = 24.
7. Find the missing number in the sequence: 3, 7, ____, 15, 19.
11The sequence increases by 4 each step: 7 + 4 = 11.
8. Find the missing number in the sequence: 16, 22, ____, 34, 40.
28The sequence increases by 6 each step: 22 + 6 = 28.
9. Find the missing number in the sequence: 14, 18, ____, 26, 30.
22The sequence increases by 4 each step: 18 + 4 = 22.
10. Find the missing number in the sequence: 19, 22, ____, 28, 31.
25The sequence increases by 3 each step: 22 + 3 = 25.
11. Find the missing number in the sequence: 4, 11, ____, 25, 32.
18The sequence increases by 7 each step: 11 + 7 = 18.
12. Find the missing number in the sequence: 15, 21, ____, 33, 39.
27The sequence increases by 6 each step: 21 + 6 = 27.
12 questions · Seed 93 · Age guidance, not curriculum certification