When we climb the stairs, sometimes 1 step by step, sometimes step by step. How many ways are there to climb 10 steps? mathematical problem

1 grade: 1 species.

Climbing level 2: 2 kinds

Climb the third level: 1+2=3 kinds (the previous step starts from 1 or the second level).

Climbing Level 4: 2+3=5 kinds (the previous step starts from Level 2 or Level 3).

Grade 5: 3+5=8 kinds.

Grade 6: 5+8= 13 species.

Grade 7: 8+ 13=2 1 species.

Grade 8: 13+2 1=34 species.

Climbing level 9: 2 1+34=55 kinds.

Grade 10: 34+55=89 kinds.