Write an expression using halving and doubling strategy to find 28x50

1400

Step-by-step explanation:

Example:  Halve 28 and double 50, obtaining 14 and 100; then mult. 14 and 100 to obtain 1400 (answer)

180

step-by-step explanation:

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540