For the construction of a roof, it needs to be supported by 4 iron rods at the four corners of the room. If the height of the room is twice that of Sam, find the estimated total length of all the iron rods. Sam's height is 108 cm.

Height of Sam = 108 cm
108 cm can be estimated as 110 cm.
(0.5 marks)

Height of the room = twice the height of Sam = 2 x 110 cm = 110 + 100 = 220 cm
(0.5 marks)

Estimating the length of each iron rod same as the height of the room.
Length of each iron rod = 220 cm

So, the total length of all the 4 iron rods = 4 x length of 1 iron rod
= 4 x 220 cm = 220 + 220 + 220 + 220
= 880 cm
(1 marks)