Answers,explanations and assessments (Number sequence test)

Number sequence test

Answers

1. 64: add 1, 3, 5, 7, etc.
2. 36, 54: add 9 each time.
3. 83.75: deduct 3.25 each time.
4. 24, 76: there are two sequences interwoven. Add 6 starting at 0 and deduct 6 starting at 100.
5. 85: add 17 each time
6. 6: x1, x2, x3, x4,x 5,x 6
7. 58: deduct 2, 4, 6, 8, 10, 12
8. 19: add 1.5, 2.5, 3.5, 4.5, 5.5
9. 12.5: there are two interwoven sequences, X 2 starting at 100 and / 2 starting at 50.
10. 9.5: add 3.75 each time.
11. 75, 26: there are two interwoven sequences, -2.5, -5, -7.5 starting at 100 and +2.5, 5, 7.5 starting at 1.
12. 108: deduct the sum of the digits of the previous number each time.
13. 26, 31: +1, +1, +2, +2, +3, +3,+4, +4, +5, +5
14. 3281: 5þ 1 each time
15. 857: deduct 28.6 each time
16. 945:x 1, x3, x5, x7, x9
17. 108: add 36 each time
18. 7, 11: there are two interwoven sequences, +1.5 starting at the first 1, and+2.5 starting at the second 1.
19. 432, 1296:x 2,x 3, x2, x3, x2, x3
20. 70, 80: there are two interwoven sequences, add 14 starting at 14 and add 16 starting at 16