4 4 5 x 5 1 2 July 8, 2019 16 32 64 128 4 4 5 x 1 2 3 4 4 5 x 2 1 12 4 3 4 x 5 1 2 as a fraction 4 5 6 x 5 1 2 4 5 x 5 1 x 2 9 4 4 5x )- 5 1 2x )=- 1 4 2 5 x 8 4 5 2 1 2 6 5 x 4 )= 1 5 2x 4 4 1 4 x 5 1 2 envelopes 4 + 4 =5 4 5 × 5 4 4 x 5 1/2 4 5 x 4