51-8•5-11 81 ÷ 9 × 7 32 ÷ 4 × 6 49 ÷ 7 × 8

Here are the results, with order of operations (multiplication/division before subtraction/addition, left to right for same level):

• 51 - 8•5 - 11 = 51 - 40 - 11 = 0
• 81 ÷ 9 × 7 = (81 ÷ 9) × 7 = 9 × 7 = 63
• 32 ÷ 4 × 6 = (32 ÷ 4) × 6 = 8 × 6 = 48
• 49 ÷ 7 × 8 = (49 ÷ 7) × 8 = 7 × 8 = 56