Because 30 times 30 = 900
30 x 30 = 900
30 x 30
27000/30 = 900
(x-1)*(x+1) = x2 - x + x - 1 = x2 - 1 So, when x = 30, 29*31 = 30*30 - 1 Or, since 30*30 = 900, 29*31 = 900-1 = 899
30 x 30
30 x 30 = 900
It is: 30 times 30 = 900
900
30 x 30 = 900
It is: 30*30 = 900
Because 30 times 30 = 900
30 x 30 = 900
900
30 x 30=900
30 x 30 = 900
30 times