Multiplys to 400 adds to 20
1 x 400 = 4002 x 200 = 4004 x 100 = 4005 x 80 = 4008 x 50 = 40010 x 40 = 40016 x 25 = 40020 x 20 = 40025 x 16 = 40040 x 10 = 40050 x 8 = 40080 x 5 = 400100 x 4 = 400200 x 2 = 400400 x 1 = 400 20 x 20= 400
