tolong dijawab dengan cara no 12,13,14

12.b)245
13.c)1.200
14.d)1,25

maaf kalau no 13 salah ya,maaf banget!!!
semoga membantu dan selamat mengerjakan!!!

12. 2,8 m = 280 cm
8,5 dm = 85 cm
50 cm = 50 cm
sisa = 280-85+50
= 195+50
= 245 cm (b)

13. 1 are = 1 dam²
0,3 ha = 30 dam² = 3000 m²
18 are = 18 dam² = 1800 m²
800 m² = 800m²
sisa = 3000-1800-800
= 1200-800
= 400 m² (a)

14. 0,75 kg
1,50 kg
1,00 kg
sisa = 0,75 + 1,50 - 1,00
= 2,25 - 1,00
= 1,25 kg (d)