Oblicz sprytnie :
a) 47 x 9 = ........................................................
125 x 9 =.........................................................
38 x 90 = ......................................................
b) 58 x 11 =..........................................................
121 x 11 =...........................................................
65 x 110 =...........................................................
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a) 47 x 9 = 40 x 9 + 7 x 9 = 360 + 63 = 423
125 x 9 = 120 x 9 + 5 x 9 = 1080 + 45 = 1125
38 x 90 = 30 x 90 + 8 x 90 = 2700 + 720 = 3420
b) 58 x 11 = 50 x 11 + 8 x 11 = 550 + 88 = 638
121 x 11 = 120 x 11 + 1 x 11 = 1320 + 11 = 1331
65 x 110 = 60 x 110 + 5 x 110 = 6600 + 550 = 7150