4 2 per 5 dikali 2 per 8 = (pakai cara) 2 1 per 4 : 6 per 10 = (pakai cara)

42/5×2/8=21/10 atau 2,1

21/4:6/10=21/4×10/6=105/12=8,75

4 2/5 × 2/8
= 22/5 × 2/8
= 44/40
= 11/10
= 1 1/10

2¼ ÷ 6/10
= 9/4 × 10/6
= 90/24
= 3 18/24
= 3¾