Adding without adding || Class - 4 || unit - 6,Mathematics || Whiteboardweb

 

 

 

 

 

 

 What is hidden?

 

 

1 dozen = 12

 

 

1 pair = 2

 

 

6 pair = 12 ( 1 dozen)

 

 

12 dozen = 1 gross (12x12=144) 

 

 

 Manu planned to give a necklace for his sister on her birthday.He bought three colour beads to make the necklace.The black bead costs 24 rupees,the white bead costs 22 rupees and the red bead costs 27 rupees each.Manu had 950 rupees with him.He bought one dozen beads from each colours.Does he have enough money to buy the beads?

 

 

 

The cost of one black bead - 24 rupees

 

 

The cost of one dozen black beads = 24 x 12 

 

24 x (10 + 2 )

 

24 x 10 + 24 x 2 

 

240 + 48 = 288 rupees

 

 

 

 

The cost of one white bead  =22 rupees

 

The cost of one dozen  white beads = 

22 x 12

 

22 x (10 + 2 )

 

22 x 10 + 22 x 2 

 

220 + 44 = 264rupees

 

 

 

The cost of one red bead  = 27 rupees

 

 The cost of one dozen red beads

27 x 12 =

 

27 x (10 + 2 )

 

27 x 10 + 27 x 2 

 

270 + 54 = 324 rupees

 

 

Total cost of beads =

 

288 +

264 

324

876 rupees

 

 

 

Manu had enough money to buy the beads.

 

 

 

Activity

 

 

 

Complete the activities in text book page number 88 and 89

(Gift , Circus)