900/45=20
therefore
20 * 45=900
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45 of them because 45 times 20 = 900
45
9 x 895 = (9 x 900) - (9 x 5) = 8100 - 45 = 8055
20 + 45 = 65 20 x 45 = 900
45*2 = 90 so 45*20 = 900 45*3 = 135 So 45*23 = 45*20 + 45*3 = 900 + 135 = 1035