# NCERT Class 6 Solutions: Whole Numbers (Chapter 2) Exercise 2.2–Part 2

Q-4 Find the product using suitable properties:

Solution:

1. (Distributive property of multiplication over addition)

2. (Distributive property of multiplication over addition)

3. (Distributive property of multiplication over addition)

4. (Distributive property of multiplication over addition)

Q-5 A taxi driver filled his car petrol tank with 40 liters of petrol on Monday. The next day, he filled the tank with 50 liters of petrol. If the petrol costs Rs 44 per liter, how much did he spend in all on petrol?

Solution:

so cost of 40 liters of petrol =

so cost of 50 liters of petrol =

(Using distributive property of multiplication over addition)

=

=

Q-6 A vendor supplies 32 liters of milk to a hotel in the morning and 68 liters of milk in the evening. If the milk costs Rs. 15 per liter, how much money is due to the vendor per day?

Solution:

so cost of 32 liters of petrol =

so cost of 68 liters of petrol =

(Using distributive property of multiplication over addition)

=

=

Therefore, Rs. 1500 is due to the vendor per day.

Q-7 Match the following:

 Equation Commutativity under multiplication Equation Commutativity under addition Equation Distibutivity multiplication under addition

Understand the above properties, carefully note the difference between commutativity and associativity.

Solution:

• We see that the number 136 is rewritten as

• It is a distributive property of multiplication over addition (c)

• We see that the numbers are rearranged under the multiplication operation.

• It is a commutativity under multiplication (associativity on the other hand would be

• The numbers are rearranged under the addition operation.

• It is a commutative under addition (associativity on the other hand would be

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