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Petrol filled in tank on Monday = 40 liters
Petrol filled in tank on Tuesday = 50 liters
Driver spend money on petrol for Monday and Tuesday = 44 × 40 + 44 × 50
= 44 × (40+50)
= 44 × 90
= Rs. 3960
Thus, a taxi driver spent Rs. 3960 on petrol.
 This is the principle of distributive property of multiplication over addition.

Eg.2) The school canteen charges Rs. 20 for lunch and Rs. 4 for milk for
each day. How much money do you spend in 5 days on these things?

Answer:
Cost of (lunch + milk) for one day = Rs (20 + 4)
Cost for 5 days = 5 × (20 + 4) = Rs. (5 × 24)
= Rs 120.
 This is the principle of distributive property of multiplication over addition.

 Patterns in whole numbers
We can arrange every number in some elementary shapes made up of dots.
The shapes we will consider as 1) a line 2) a rectangle 3) a square 4) a triangle.

 Every number can be arranged as a line

 The number 2 is shown as:

 The number 3 is shown as:

 Some numbers can be shown also as rectangles.

 The number 6 can be shown as a rectangle ( 2 rows × 3 columns):

 Some numbers can be shown also as squares.

 The number 4 can be shown as a square (2 rows × 2 columns):

 The number 9 can be shown as a square (3 rows × 3 columns):

 Some numbers can be shown as triangles..

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