Type 1: Difference

1) 2, 6, 12, 20, 30, ?

a. 40
b. 42
c. 36
d. 38

2) 0, 6, 24, 60, 120, 210, ?

a. 330
b. 340
c. 336
d. 342

3) 200, 209, 234 ? 404, 573

a. 283
b. 275
c. 285
d. 279

4) 26, 158, 290, 422 ? 686

a. 554
b. 582
c. 564
d. 540

5) 325, 314, 288, 247, 191 ?

a. 116
b. 120
c. 126
d. 130

6) 15, 18, 16, 19, 17, 20 ?

a. 18
b. 16
c. 20
d. 19

7) 39, 23, 15, 11, 9 ?

a. 2
b. 6
c. 8
d. 4

8) 43, 69, 58, 84, 73 ?

a. 101
b. 103
c. 99
d. 96

9) 15, 19, 83, 119, 631 ?

a. 746
b. 722
c. 731
d. 715


Type 2: Multiplication

1) 5, 5, 15, 75, 525, 4725 ?

a. 51875
b. 51975
c. 51075
d. 51175

2) 13, 29, 61 ? 253

a. 120
b. 125
c. 130
d. 135

3) 963, 927, 855, 747, 603, 423 ?

a. 207
b. 195
c. 204
d. 199

4) 18, 20, 44, 138, 560, 2810 ?

a. 17882
b. 19892
c. 16872
d. 18762

5) 25, 48, 94, 186, 370 ?

a. 738
b. 750
c. 732
d. 726

6) 11, 10, 18, 51, 200 ?

a. 895
b. 995
c. 1095
d. 870

7) 12, 18, 36, 102, 360 ?

a. 1486
b. 1386
c. 1368
d. 1468

8) 16, 12, 18, 40.5, 121.5, 455.625 ?

a. 2050.3125
b. 2051.3125
c. 2050.3175
d. 2051.3250

9) 6, 26, 134, 666, 3334, 16666 ?

a. 83334
b. 83324
c. 83344
d. 83354


Type 3: Division

1) 1200, 480, 192, 76.8, 30.72, 12.288 ?

a. 4.8152
b. 4.78152
c. 5.9152
d. 4.9152

2) 1015, 508, 255, 129, 66.5 ? 20.875

a. 25.75
b. 35.75
c. 25.50
d. 35.50

3) 1050, 350, 140, 70, 46.66 ?

a. 46.66
b. 44.72
c. 48.72
d. 40.72

4) 656, 352, 200, 124, 86 ?

a. 47
b. 56
c. 67
d. 64

5) 51975, 9450, 2100, 600, 240, 160 ?

a. 40
b. 320
c. 80
d. 200

6) 186, 94, 48, 25 ?

a. 12.5
b. 13.5
c. 11.5
d. 13.25

7) 100, 400 ? 1066.66, 1066.66, 853.33

a. 600
b. 900
c. 800
d. 700

8) 4725, 1050, 300, 120, 80 ?

a. 160
b. 200
c. 60
d. 100

9) 60, 30, 80, 40, 64, 32, 36.57 ?

a. 20.26
b. 22.82
c. 26.72
d. 18.28


Type 4: Mixed Variety

1) 19, 26, 40, 68, 124 ?

a. 226
b. 232
c. 236
d. 240

2) 14, 24, 43, 71, 108 ?

a. 136
b. 116
c. 154
d. 184

3) 13, 25, 61, 121, 205 ?

a. 344
b. 313
c. 307
d. 343

4) 161, 164, 179, 242, 497 ?

a. 840
b. 1064
c. 1520
d. 996

5) 14, 1004, 1202, 1251.5, 1268 ?

a. 1266.75
b. 1275.50
c. 1276.50
d. 1266.75

6) 35, 256, 451, 620, 763 ?

a. 880
b. 792
c. 798
d. 788

7) 5, 11, 32 ? 444

a. 110
b. 108
c. 102
d. 112

8) 960, 240, 480, 120, 240 ?

a. 120
b. 60
c. 30
d. 90

9) 27, 17 ? 4292, 237.5, 718.5

a. 9
b. 132
c. 23
d. 98


ANSWER KEY:

Type 1

  1. 42
  2. 336 ; Chk diff of diff i.e. 12 18  24  …
  3. 283 ; add square of prime no. in each step ; 9,25,49,121,so on
  4. 554 ; Diff : +132
  5. 120 ; chk diff of diff e. -15
  6. 18 ; alternate diff.
  7. 8; Diff is 16 8   4  2   1
  8. 99 ; Diff is +26  -11  +26  -11
  9. 731 ; Diff is 4   64   36  512  e   2 43  62   83

Type 2

1) 51975;

5 * 1=5
5 * 3=15
15 * 5=75
75 * 9=4725
4725 * 11=51975

2) 125;

5 * 2 + 3 =13
13 * 2 + 3=29
29 * 2 + 3=61 and so on

3) 207 ;

–(36*1) – (36*2) –(36*3)….

4) 16872;

*1+2
*2+4
*3+6….

5) 738;

25*2-2
48*2-2
94*2-2
186*2-2….

6) 995;

11*1-1
10*2-2
18*3-3…

7) 1386;

12*4 -30
18*4 -36
36*4 -42
102*4 -48

8) 2050.3125Maths Series Practice Questions

9) 83334;

6*5-4
26*5+4
134*5-4
666*5+4
3334*5-4…



Type 3

1) 4.9152 ; Divide each term by 2.5

2) 35.75 ;

(1015 +1) / 2 = 508
(508 + 2) / 2 = 255
(66.5 + 5) /2 = 129
(129 + 4) / 2= 66.5….

3) 46.66 ;

Divide by 3 then 2.5 then 2 then 1.5….

4) 67;

656/2 +24
352/2 +24
200/2 +24
124/2 +24….

5) 320;

51975/5.5
9450/4.5
2100/3.5
600/2.5….

6) 13.5; divide by 2 + 1

7) 800;

100/.25
400/.5
800/.75
1066.66/1…..

8) 160;

4725 / 4.5=1050
1050/3.5=300
300/2.5=120
120/1.5=80
80/0.5=160
9) 36

The series is ÷6, ÷5, ÷4, ÷3 …

10) 18.28;

2 series are here
60 80 64 36.57
60/.5 = 80
80/1.25 =64
64/1.75=36.57
&
30 40 32 ?
30/.75=40
15/1.25=32
15/1.75=18.28



Type 4

1) 236;

19 + 1 * 7 =26
26 + 2 * 7 =40
40 + 4 * 7 =68
68 + 8 * 7 =124…

2) 154 ;

14 + 10 + 0 =24
24 + 10 + 9 =43
43 +28 + 9 =71
71 + 37 + 9 =108

3) 313 ;

13+1*12
25+3*12
61+5*12
121+9*12
205+9*12

4) 1520;

Diff is 3 15 63 255 …
So 3*4+3
15*4+3
63*4+3
255*4+3=1023
1023+497=1520

5) 1276.50;

14+990
1004+990/5
1202+198/4
1251.5+49.5/3
1268+16.5/2

6) 880;

35+221
256+(221-26)
451+(195-26)
620+(169-26)
763+(143-26)

7) 108;

(5+6)*1
(11+5)*2
(32+4)*3
(108+3)*4…
8) 60;

960/4=240×2=480………..240/4=60

9) 23;

27*0.5+0.5*7=17
17*1+1*6=23
23*1.5+1.5*5=42
42*2+2*4=92


 

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