Răspuns:
a) 245x25 = 245x(10+10+5)=
= 245x10+245x10+245x5=
=2450+2450+1225=6125
548x44 = 548x(10+10+10+10+4)=
=548x10+548x10+548x10+548x10+548x4=
=5480+5480+5480+5480+2192=24112
b)687x14 = 687x(10+4)=
=687x10+687x4=
=6870+2748= 9618
343x15 = 343x(10+5)=
=343x10+343x5=
=3430+1715=5145
c)506x15=506x(10+5)=
=506x10+506x5=
=5060+2530=7590
435x25=435(10+10+5)=
=435x10+435x10+435x5=
=4350+4350+2175=10875
d)208x28=208(10+10+8)=
=208x10+208x10+208x8=
=2080+2080+1664=5824
205x11=205(10+1)
205x10+205
2050+205=2255
:)
