18 1 8 2 5 July 8, 2019 16 32 64 128 8 2 5 x 18 1 3 18 evaluate i 8 1 53 2 4 8 2 5 times 18 1 3 8 2 5 plus 18 1 3 8 2 5 x 18 1 3 as a fraction Sigma 18 50mm 1 2 8