Question

Calculeaza folosind procedeul preferat,apoi verifica folosind calculatorul
Exemplu:1251x12=1251x(10+2)=
=1251x10+1251x2=
=12510+2502=
=15012

a) 3245x25=
6548x44=

b)12687x14=
18343x15=

c)22506x15=
20435x25=

d)35208x28=
42205x11=

Answer 1

a)
3245x25=3245x(10+10+5)=
=3245x10+3245x10+3245x5=
=32450+32450+16225=
=81125

6548x44=6548x(10+10+10+10+4)=
=6548x10+6548x10+6548x10+6548x10+6548x4=
=4x65480+26 192=
=261920+26192=
=288112

b)
12687x14=12687x(10+4)=
=12687x10+12687x4=
=126870+50748=
=177618
18343x15=

c)
22506x15=22506x(10+5)=337 590
=22506x10+22506x5=
=225060+112530=
=337590

20435x25=20435x(20+5)=
=20435x20+20435x5=
=408700+102175=
=510 875

d)
35208x28=35208x(10+10+8)=
=35208x10+35208x10+35208x8=
=352080+352080+281664=
=985824
42205x11=42205x(10+1)=
=42205x10+42205x1=
=422050+42205=
=464255