Number Series (Previous Year Questions )test -1

  • Grade 6th,
  • Grade 7th,
  • Grade 8th
  • CCSS.Math
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Quizzes Created: 6 | Total Attempts: 1,347
| Attempts: 748 | Questions: 15 | Updated: Jun 15, 2026
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Question 1 / 15
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1) 65, 70, 63, 74, 61, ?

Explanation

We can note that consecutive prime numbers are either added or subtracted starting from 5.

65+5 = 70
70-7 = 63
63+11 = 74
74-13 = 61
61+17 = 78

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About This Quiz
Number Series (Previous Year Questions )test -1 - Quiz

Challenge your mathematical prowess with this Number Series quiz, featuring a series of progressively complex problems that test your ability to discern patterns and calculate the next number in a sequence.

2) 59, 66, 80, 108, ?, 276

Explanation

Explanation:

Looking at the differences between consecutive numbers:

66 - 59 = 7

80 - 66 = 14

108 - 80 = 28

? - 108 = 56 (doubling pattern)

276 - ? = 112 (doubling pattern)

The differences are doubling each time: 7, 14, 28, 56, 112...

Therefore:

108 + 56 = 164

Submit

3) 11, 20, 38, 74, ?

Explanation

11*2 - 2 = 22-2 =20
20*2 - 2= 40-2 = 38
38*2 - 2= 76 - 2 = 74
74*2 - 2 = 148-2 = 146

Submit

4) 15, 21, 38, 65, 101, ?

Explanation

21 - 15 = 6
38 - 21 = 17
65 - 38 = 27
101 - 65 = 36
Now, let us take the difference of difference.
17 - 6 = 11
27 - 17 = 10
36 - 27 = 9
Continuing the sequence, we get the next term as 36+8 = 44
101 + 44 = 145.

Submit

5) 24, 28, 19, 35, 10, ?

Explanation

24 + 4 = 28
28 - 9 = 19
19 + 16 = 35
35 - 25 = 10
10 + 36 = 46

The pattern is +4, -9, +16, -25, +36 (Squares with alternate sign)

Submit

6) 47, 23, 11, 5, 2, ?

Explanation

47*0.5 - 0.5= 23.5 - 0.5 = 23
23*0.5 - 0.5 = 11.5 - 0.5 =11
11*0.5 - 0.5 = 5.5 - 0.5 = 5
5*0.5 - 0.5 = 2.5 - 0.5 = 2
2*0.5 - 0.5 = 1 - 0.5 = 0.5

Submit

7) 1, 2, 6, 21, 88, ?

Explanation

1*1 + 1 = 2
2*2 + 2 = 6
6*3 + 3 = 21
21*4 + 4 = 88
88*5 + 5 = 445

Submit

8) 7, 16, 45, 184, 915, ?

Explanation

7*2 + 2= 14+2 = 16
16*3 - 3 = 48 - 3 = 45
45*4 + 4 = 180+4 = 184
184*5 - 5 = 920 - 5 = 915.
915*6 + 6 = 5490+ 6 = 5496.

Submit

9) 6, 5, 8, 21, 80, ?

Explanation

6*1 -1 = 5
5*2 - 2 = 10-2 =8
8*3 - 3 = 24-3 = 21
21*4-4 = 84-4 = 80
80*5-5 = 395

Submit

10) 9, 10.8, 14.4, 21.6, ?, 64.8

Explanation

9 + 1.8 = 10.8
10.8 + (2*1.8) = 10.8 + 3.6 = 14.4
14.4 + (2*3.6) = 14.4+7.2 = 21.6
21.6 + (2*7.2) = 21.6 + 14.4 = 36

Submit

11) 13, 14, 30, 93, ?, 1885

Explanation

13*1 + 1 = 14
14*2 +2 = 28+2 = 30
30*3 + 3 = 90+3 =93
93*4 + 4 = 372+4 = 376

Submit

12) 8, 14, 25, 46, 82, ?

Explanation

14 - 8 = 6
25 - 14 =11
46 - 25 = 21
82 - 46 = 36

Now take the difference of difference
11 - 6 = 5
21 - 11 = 10
36 - 21 = 15

The next term will be 20. The difference will be 36 + 20 = 56.

The required term is 82 + 56 = 138.

Submit

13) 9, 5, 6, 10.5, 23, ?

Explanation

9*0.5 + 0.5 = 4.5 + 0.5 = 5
5*1 +1 = 5+1 =6
6*1.5 + 1.5 = 9+1.5 =10.5
10.5*2 + 2 = 21+2 = 23
23*2.5 + 2.5 = 57.5+2.5 = 60.

Submit

14) 13, 6, 5, 6, 10, ?

Explanation

13*0.5 - 0.5 = 6.5-0.5 = 6
6*1 - 1 = 6-1 = 5
5*1.5 - 1.5 = 7.5 - 1.5 = 6
6*2 - 2 = 12-2 = 10
10*2.5 - 2.5 = 25-2.5 =22.5

Submit

15) 14, 8, 7, 11.5, 22, ?

Explanation

14*0.5 + 1 = 7+1= 8
8*1 - 1 = 8-1 = 7
7*1.5 + 1 = 10.5 + 1 = 11.5
11.5*2 - 1 = 23 - 1 = 22
22*2.5 +1 = 55+1 =56

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  • All
    All (15)
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  • Answered
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65, 70, 63, 74, 61, ?
59, 66, 80, 108, ?, 276
11, 20, 38, 74, ?
15, 21, 38, 65, 101, ?
24, 28, 19, 35, 10, ?
47, 23, 11, 5, 2, ?
1, 2, 6, 21, 88, ?
7, 16, 45, 184, 915, ?
6, 5, 8, 21, 80, ?
9, 10.8, 14.4, 21.6, ?, 64.8
13, 14, 30, 93, ?, 1885
8, 14, 25, 46, 82, ?
9, 5, 6, 10.5, 23, ?
13, 6, 5, 6, 10, ?
14, 8, 7, 11.5, 22, ?
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