Question

efectueaza,respectand regulile invatate pentru a calcula mai repede:
a) 294 864+293 663+292 462+5 136+6 337+7 538=
b) 386x99=386x(100-1)=
c) 2 485x999=
d) 4x825+4x157+4x1 018=
e) 5 496:12+5 352:12=

Answer 1

b)  386x99=386x(100-1)
     386x99=386x99
     38214=38214

c)  2 485x99= 240615

d) 4x825+4x157+4x1 018=
3300+628+4072=
3928+4072=8000

e) 5 496:12+5 352:12=
458+446=904

Answer 2

a) 294 864+293 663+292 462+5136+6337+7538=
=588527+297598+13875=
=886125+13875=
=900000

b) 386×99=386×(100-1)=
38214=386×99=
38214=38214

c) 2485×999=
=2482515

d) 4×825+4×157+4×1018=
=3300+628+4072=
=3928+4072=
=8000

e) 5496:12+5352:12=
=458+446=
=904