Sequence Flashcards
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 88, 144…
Answer: sum of the 2 numbers before (1 +1=2, 2 + 1=3, 2 +3=5…)
233
1, 3, 5, 7…
Answer: +2
9
1, 8, 27, 64, 125, 216…
Answer: Increase by cube numbers (1x1x1=1, 2x2x2=8, 3x3x3=27…)
343
1, 4, 9, 16, 25, 36, 49, 64…
Answer: they are Squares (square root of 1 is 1, square root of 4 is 2, square root of 9 is 3…)
9x9=81
1, 3, 6, 10, 15, 21, 28, 36…
45
2, 4, 8, 16, 32, 64, 128…
Answer: 2x4=8, 2x8=16, 2x16=32..)
256
1, 4, 7, 10, 13, 16, 19, 22…
25
1, 2, 4, 7…
Answer: add 1, then add 2,3,4 (1+1=2, 2+2=4, 4+3=7, 7+4=11)
11
1, 2, 4, 7, 12…
Answer: after 1 and 2, add the two previous numbers + 1 (7+4+1=12, 12+7+1=20)
20
1, 2, 4, 7, 13…
Answer: after 1, 2 and 4, add the previous three numbers (1+2+4=7, 2+4+7=13, 4+7+13=24)
24
3, 8, 13, 18, 23…
Answer: +5
28
25, 23, 21, 19, 17…
Answer: -2
15
1, 3, 9, 27, 81…
Answer: x3
243
2, 6, 18, 54…
Answer: x3
162
10, 5, 2.5, 1.25, 0.625…
Answer: x0.5
0.3125
