tolong ya 1 sampe 4 beserta cara nya

MAPEL : MTEMATIKA.
KELAS : 4 SAMPAI 6 SD.
BAB : SATUAN LUAS

1.) = 35 are = 35 × 100 = 3.500.
= 28 ca <--- tetap.
= 11 dam ^2 = 11 × 100 = 1.100
= 3.500 - 28 + 1.100
= 4.572 m ^2 ( D )

2.) = 3 1/4 are = 13 /4 ---> desimal = 3,25.
= 1,75 dam ^2 <----- tetap.
= 350 m ^2 = 3,5.
= 3,25 + 1,75 - 3,5
= 1,5 dam ^2 ( A)

3.) = 3/8 ha = 3/8 ×10.000 = 3.750.
= 1.250 ca <---- tetap.
= 12 dam ^2 = 1.200.
= 3.750 - 1.250 - 1.200
= 1.300 m^ 2 ( C )

4.) = 990 m ^2 <---- tetap.
= 4,8 are =4,8 × 100 = 480.
= 2 1/2 dam ^2 = 5/2 ×100 = 250.
= 990 + 480 - 250
= 1.220 m ^2 ( D)

Itu caranya dan jawabanya .Semoga bermanfaaat ^-^