3. LEARNING OBJECTIVES:
Learning Objectives
After this lesson, students will be able to:
•define 'whole numbers'
•explain what makes a number a whole number
•demonstrate understanding of whole numbers on a number
line
• Understand distributive property of multiplication over
addition
•Discuss on Commutative and Associative properties of
addition and multiplication of whole numbers.
4. Commutative Property of Addition
If a and b are any two whole numbers, then
a × b = b × a
This is called Commutative Property of Addition
for whole numbers.
Commutative Property of Multiplication
If a and b are any two whole numbers, then
a + b = b + a
This is called Commutative Property of Addition
for whole numbers.
5. Associative Property of Addition
If a, b and c are any three whole numbers, then
a + ( b + c) = (a + b) + c
This is called associative property of addition.
Associative Property of Mutiplication
If a, b and c are any three whole numbers, then
a × ( b × c) = (a × b) × c
This is called associative property of
multiplication.
22. Answer 5:
Petrol filled on Monday = 40 litres
Petrol filled on next day = 50 litres
Total petrol filled = 90 litres
Now,
Cost of 1 litre petrol = ₹ 44
Cost of 90 litres petrol = 44 x 90
= 44 x (100 – 10)
= 44 x 100 – 44 x 10
= 4400 – 440
= ₹ 3960
Therefore, he spent ₹ 3960 on petrol.
23. Question 6:
A vendor supplies 32 litres of milk to a hotel in a morning and 68 litres of
milk in the evening. If the milk costs ₹15 per litre, how much money is due to
the vendor per day?
HW
