Question

1. convertir 23-7\ en mm (arrondir au mm près) :
2. nb pouces = 23 x 12 + 7\ = 276\ + 7\ = 283\
3. nb de mm = 283\ x 25,4 = 7 188,2 --> 7 188 mm

1. convertir 31-9\ en mm (arrondir au mm près) :

1)

Explanation:

Step1: Convert feet to total inches

$31' \times 12 + 9'' = 372'' + 9'' = 381''$

Step2: Convert inches to millimeters

$381'' \times 25.4 = 9677.4$

Step3: Round to nearest mm

$9677.4
ightarrow 9677$

Answer:

9677 mm