13 x 4 20 July 8, 2019 16 32 64 128 13 x 4 20 13 2 13 x 4 20 x 3 13 x 20 4 5 13 x 20 x4 13 1 4 x 20 propeller 12 13 x 4 16 4 x 20 4 x 2 13 20 as a decimal 4 13 x 20.4 x 13 × 4 13 x - 4
