The answer to the problem 390 times 20 is 7800. The easiest way to work multiplication problems is to use a simple calculator. Another easy way is to know your mulitplication tables.
20% more of 390= 390 + (0.2 x 390) = 468
19.5
390 squared is 390 times 390 = 152,100
20 percent off of 390 is 78.
390 * 45 = 17,550
0.01 multiplied by 390 is 3.9
78*5=390
yes 65 times 6 is 390
78 x 5 = 390
20%
280
It goes 10 times, since 390 is bigger than 10.