a)
[tex]4 \div 2 = 2mm[/tex]
[tex]2 + 2 = 4mm[/tex]
b)
[tex]18 \div 2 = 9mm[/tex]
[tex]9 + 9 + 18 = 18 + 18 = 36mm[/tex]
c)
[tex]32 \div 4 = 8mm[/tex]
[tex]8 \times 6 = 48mm[/tex]
