no 6 sampai 11 pakai cara

6)
= 13/40
= 13 : 40
= 0,325

7)
= 13/40 × 2,5/2,5
= 32,5/100
= 32,5 %

8)
= ( 60,23 - 35,68 ) + 15,375
= 24,55 + 15,375
= 39,925

9)
= ( 20,25 × 7,4 ) : 4,5
= 149,85 : 4,5
= 33,3

10)
= 1,8/0.3 × 1.8/0.3
= 36

11)
( maaf aku gak ngerti yang nomor ini.... maaf yaa... )

Semoga bermanfaat...