The Intelligence section of AISSEE (25 questions for Class 6) and the Reasoning section of the RMS CET test how quickly you spot patterns. Try these 10 MCQs on Number Series in about 8 minutes, then check the answer key and explanations below.
Quick facts: AISSEE 2027 will be held on Sunday, 31 January 2027. There is no negative marking, so attempt every question. Online applications are open until 2 December 2026 on exams.nta.nic.in/sainik-school-society.
Practice Questions
Q1. Find the next number in the series: 3, 5, 7, 11, 13, ?
(A) 18
(B) 17
(C) 20
(D) 14
Q2. Find the missing number: 9, 15, 21, ?, 33, 39
(A) 27
(B) 25
(C) 33
(D) 23
Q3. Find the wrong number in the series: 14, 21, 28, 35, 42, 50
(A) 14
(B) 50
(C) 42
(D) 21
Q4. Find the next number in the series: 5, 7, 11, 13, 17, ?
(A) 16
(B) 17
(C) 22
(D) 19
Q5. Find the missing number: 28, 37, 46, 55, ?, 73
(A) 60
(B) 70
(C) 68
(D) 64
Q6. Find the wrong number in the series: 3, 7, 9, 12, 15, 18
(A) 9
(B) 7
(C) 3
(D) 18
Q7. Find the next number in the series: 4, 9, 16, 25, 36, ?
(A) 49
(B) 57
(C) 37
(D) 41
Q8. Find the missing number: 18, 22, 26, ?, 34, 38
(A) 32
(B) 24
(C) 30
(D) 26
Q9. Find the wrong number in the series: 13, 16, 19, 22, 26, 28
(A) 22
(B) 28
(C) 26
(D) 13
Q10. Find the next number in the series: 4, 8, 12, 16, 20, ?
(A) 18
(B) 26
(C) 30
(D) 24
Answer Key with Explanations
(B) 17 — These are consecutive prime numbers.
(A) 27 — Each term increases by 6.
(B) 50 — The series increases by 7; 50 should be 49.
(D) 19 — These are consecutive prime numbers.
(D) 64 — Each term increases by 9.
(B) 7 — The series increases by 3; 7 should be 6.
(A) 49 — These are squares of consecutive numbers: 2², 3², 4²… so next is 7² = 49.
(C) 30 — Each term increases by 4.
(C) 26 — The series increases by 3; 26 should be 25.
(D) 24 — Add 4 each time.
How did you score?
9–10 correct: excellent — move on to a full-length mock test. 6–8: good — revise the explanations of the questions you missed. Below 6: study this topic again from your NCERT book and retry these questions after two days.
Free AISSEE / RMS Mock Test
Want a full-length mock test with an All-India rank? Enunciate Academy runs online coaching for Sainik School, RMS, Navodaya and RIMC entrance exams for Class 6 and 9 students across Andhra Pradesh and Telangana. Message us on WhatsApp (94924 44498) to get a free mock test, or see the Spark batch details.
