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1) 8/9 × 9/11 = 8/11 2) 27/64 ÷ 9 = 27/64 × 1/9 = 3/64 3) 8/11 × 3/4 ÷ 1/2 = 2/11 × 3 × 2 = 12/11 4) 4/5 × 1/9 ÷ 2/3 = 4/5 × 1/9 × 3/2 = 2/5 × 1/3 = 2/15