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Unit – 4
Identities
Activity 1
Product of sums
(x+y) (u+v)=xu+xv+yu+yv
using this
25×12 = (20+5)(10+

By Isabella

Unit – 4
Identities
Activity 1
Product of sums
(x+y) (u+v)=xu+xv+yu+yv
using this
25×12 = (20+5)(10+2)
– 20×10+20×2+5×10+5×2
=200+40+50+10
= 300
a) 32×11
b) 55×13
c) 101×202​

About the author
Isabella

A room is 20m long and 18m broad find the cost of carpeting the room with a carpet of width 1.5m at the rate of 60rs per meter

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