20*21 is 420
Answered by: Emilio Aranda_EL Paso, Tx (Emilioa)
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3 * 21 = 3*(20 + 1) = 3*20 + 3*1 = 60 + 3 = 63.
41
(5)21 x (4)11 = (5)11 x (5)10 x (4)11 = (5)10 x (5 x 4)11 = (5)10 x (20)11 =(5)10 x 20 x (20)10 = 20 x (5 x 20)10 = 20 x (100)10 = 2 x (10)1 x (10)20 =2 x (10)21 = 2,000,000,000,000,000,000,000
(20/21)/(2/3) = (20/21) x (3/2) = 10/7 = 1 and 3/7 = 1.428571429
10 times with 20 remaining 230 - 20 = 210 = 21 x 10