52-2•18 64-3•14 28+4•13 90-15•4 80-12•6 60-16•3 74+60÷3 42-100÷10 91-100÷20

Let's calculate each of these expressions step by step:

1. 52 - 2 • 18

   • 2 • 18 = 36
   • 52 - 36 = 16

2. 64 - 3 • 14

   • 3 • 14 = 42
   • 64 - 42 = 22

3. 28 + 4 • 13

   • 4 • 13 = 52
   • 28 + 52 = 80

4. 90 - 15 • 4

   • 15 • 4 = 60
   • 90 - 60 = 30

5. 80 - 12 • 6

   • 12 • 6 = 72
   • 80 - 72 = 8

6. 60 - 16 • 3

   • 16 • 3 = 48
   • 60 - 48 = 12

7. 74 + 60 ÷ 3

   • 60 ÷ 3 = 20
   • 74 + 20 = 94

8. 42 - 100 ÷ 10

   • 100 ÷ 10 = 10
   • 42 - 10 = 32

9. 91 - 100 ÷ 20

   • 100 ÷ 20 = 5
   • 91 - 5 = 86

Here are the results for each expression:

1. 16
2. 22
3. 80
4. 30
5. 8
6. 12
7. 94
8. 32
9. 86