$$3/5+(2/3)(2/3)-4/9 \times 3/8$$
$\frac{79}{90}\approx 0.877777778$
$$\frac{3}{5}+\frac{2\times 2}{3\times 3}-\frac{\frac{4}{9}\times 3}{8}$$
$$\frac{3}{5}+\frac{4}{9}-\frac{\frac{4}{9}\times 3}{8}$$
$$\frac{27}{45}+\frac{20}{45}-\frac{\frac{4}{9}\times 3}{8}$$
$$\frac{27+20}{45}-\frac{\frac{4}{9}\times 3}{8}$$
$$\frac{47}{45}-\frac{\frac{4}{9}\times 3}{8}$$
$$\frac{47}{45}-\frac{\frac{4\times 3}{9}}{8}$$
$$\frac{47}{45}-\frac{\frac{12}{9}}{8}$$
$$\frac{47}{45}-\frac{\frac{4}{3}}{8}$$
$$\frac{47}{45}-\frac{4}{3\times 8}$$
$$\frac{47}{45}-\frac{4}{24}$$
$$\frac{47}{45}-\frac{1}{6}$$
$$\frac{94}{90}-\frac{15}{90}$$
$$\frac{94-15}{90}$$
$$\frac{79}{90}$$
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$\frac{79}{2 \cdot 3 ^ {2} \cdot 5} = 0.8777777777777778$
