Page 46 - Math 4

Fundamental Operations Fundamental Operations

b) 3 × 0 = , 6 × 0 = , 9 × 0 = , 14 × 0 =
Fact II: The product of any number and 0 (zero) is always 0.

c) 4 × 5 = 5 × 4 , 7 × 10 = 10 × 7 = , 9 × 6 = 6 × 9
Fact III: The product remains the same even if the order of multiplier and

multiplicand is interchanged.
3.7. Multiplication of 10, 100, 200, 3000, ... and so on

Let's investigate the idea of multiplication of the numbers ending with 0 (zeros).

5 times 10 is 50. 3 times 30 is 90.
5 × 10 = 50 3 × 30 = 90

2 times 100 is 200. 2 times 200 is 400.
2 × 100 = 200 2 × 200 = 400

Similarly,

4 × 10 = 40, 40 × 10 = 400, 40 × 100 = 4000

6 × 20 = 120, 60 × 20 = 1200, 60 × 200 = 12000

Classwork - Exercise
1. Let's tell and write the products as quickly as possible.

a) 3 × 10 = 30 × 10 = 30 × 100 =

b) 5 × 20 = 50 × 20 = 50 × 200 =

c) 5 × 30 = 50 × 30 = 50 × 300 =

d) 6 × 30 = 60 × 30 = 60 × 300 =

2. a) 2 × 10 = 2 × 100 = 2 × 1000 =

b) 4 × 20 = 4 × 200 = 4 × 2000 =

c) 6 × 40 = 6 × 400 = 6 × 4000 =

d) 8 × 60 = 8 × 600 = 8 × 6000 =
44
vedanta Excel in Mathematics - Book 4
v edanta Ex c e l in Mathematics - Book 4 44 Approved by Curriculum Development Centre, Sanothimi, Bhaktapur