1)заполни окошки нужными числами и закончи вычисления. 19*30=19*(3* )= (19* )*10= 15*14=15*( *7)=(1 * )*7= 2)вычисли 15*16= 27*40= 18*500= 9*4000= 6*3000=

19 * 30 = 19 * (3 * 10) = (19 * 3) * 10 = 57 * 10 = 570

15 * 14 = 15 * (2 * 7) = (15 * 2) * 7 = 30 * 7 = 210

15 * 16 = 15 * (4 * 4) = (15 * 4 ) * 4 = 60 * 4 = 240

27 * 40 = 27 * (4 * 10) = (27 * 4) * 10 = 108 * 10 = 1080

18 * 500 = 18 * (5 * 100) = (18 * 5) * 100 = 90 * 100 = 9000

9 * 4000 = 9 * (4 * 1000) = (9 * 4) * 1000 = 36 * 1000 = 36000