Question

b)387 km- 6.990 dam =.........km

c)909 dam + 8.700 cm =..........m

d) 187.000 mm- 3..590 cm = ........... dm

Answer 1

B) 387 km - 6.990 dam = ... km
6.990 dam = 69,9 km
387 km - 69,9 km = 317 , 1 km

C)909 dam + 8.700 cm = ...m
909 dam = 9090 m 
8.700 cm = 87 m
9090 m + 87 m = 9177 m

D)187.000 mm - 3.590 cm = ... dm
187.000 mm = 1870 dm
3.590 cm = 359 dm
1870 dm - 359 dm = 1511 dm

Answer 2

Transformam intai 
b)387 km-6990dam=?km
387 km+69,9km=317,1

c)909 dam+8700 cm=?m
9090m+87=9177M

D)187.000mm-3,590 cm=?dm
1870-359=1511
SPER CA E BINE