(15+9)•10=24x10=240
15x10+9x10=150+90=240
100•(23+341)= 100x364=36400
100x23+100x341=2300+34100=36400
1000•(21+314)=1000x335=335000
1000x21+1000x314=21000+314000=335000
(543-207)•100=336x100=33 600
543x100-207x100=54 300-20 700=33 600
(905-327)•1000= 578x1000=578000
905x1000-327x1000=905000-327000=578 000
100•(9230-8103)=100x1127=112700
100x9230-100x8103=923000-810300=112700
