Lisa wants to frame her little brothers drawings is 43.5 cm by 934 mm how many cm of wood framing will she need

Okay, her brother drawings are 43.5 cm by 934 mm.

First thing we need to do id get alike measurements. 
1 cm = 10 mm.

Multiply 43.5 by 10          934 mm = 435

Now since we are framing something we need to find the perimeter. 

Write an equation: P= cm of wood= w     

w= 2(43.5)+2(435)

Simplify:
w=951

951 cm of wood