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Number Series

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1 / 8

Find the number that continues the series in the most sensible way:
0.5 1 2 4 [?]

×2 pattern. 4 × 2 = 8

2 / 8

Find the number that continues the series in the most sensible way:
5 10 20 40 [?]

100

×2 pattern. 40 × 2 = 80

3 / 8

Find the number that continues the series in the most sensible way:
3 5 9 17 33 [?]

Doubles and adds 1: ×2+1. 33×2+1 = 65

4 / 8

Find the number that continues the series in the most sensible way:
7 14 11 22 19 38 [?]

Alternates: ×2, -3. Last was ×2, now -3 → 38 - 3 = 35

5 / 8

Find the number that continues the series in the most sensible way:
81 27 9 3 [?]

0.5

1.5

÷3 each time. 3 ÷ 3 = 1

6 / 8

Find the number that continues the series in the most sensible way:
8 4 2 1 0.5 [?]

0.25

0.75

0.2

0.4

Dividing by 2 each time. 0.5 ÷ 2 = 0.25

7 / 8

Find the number that continues the series in the most sensible way:
2 5 10 17 26 [?]

Differences: +3, +5, +7, +9. Next is +11 → 26 + 11 = 37.

8 / 8

Find the number that continues the series in the most sensible way:
1 4 9 16 25 [?]

Sequence of square numbers. Next is 6² = 36.

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1 / 8

Find the number that continues the series in the most sensible way:
2 6 12 20 30 [?]

Differences: +4, +6, +8, +10. Next is +12 → 30+12=42

2 / 8

Find the number that continues the series in the most sensible way:
1 2 6 24 120 [?]

720

600

480

500

620

Factorials. 5! = 120 → 6! = 720

3 / 8

Find the number that continues the series in the most sensible way:
121 100 81 64 [?]

Squares of 11,10,9,8. Next is 7² = 49

4 / 8

Find the number that continues the series in the most sensible way:
2 4 7 11 16 [?]

plus2, plus3, plus4, plus5 ... Next is +6 → 16 + 6 = 22

5 / 8

Find the number that continues the series in the most sensible way:
5 10 20 40 [?]

100

×2 pattern. 40 × 2 = 80

6 / 8

Find the number that continues the series in the most sensible way:
50 45 40 35 [?]

Decreasing by 5. 35 - 5 = 30

7 / 8

Find the number that continues the series in the most sensible way:
3 5 9 17 33 [?]

Doubles and adds 1: ×2+1. 33×2+1 = 65

8 / 8

Find the number that continues the series in the most sensible way:
100 90 81 73 66 [?]

-10, -9, -8, -7... Next is 66 - 6 = 60.

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