Hello!
Use the Order of Operations to solve. PEMDAS: 
Parentheses 
Exponents 
Multiplication 
Division
Addition
Subtraction
EQUATION #1: 
45 ÷ 2 = 22.5
16 × 22.5 = 360
ANSWER: 
360
EQUATION #2: 
12 × 4 = 48 
23 ÷ 2 = 11.5
13 ÷ 4 = 3.25 
Since there's no more division, we'll move onto addition. 
48 + 11.5 + 3.25 = 62.75
ANSWER: 
62.75
*Write down PEMDAS so you'll remember the order of operations!