WHOLE NUMBERS (POST-4)

GOOD MORNING BOYS !
You have learnt about commutativity of addition and multiplication.

SUBTRACTION AND DIVISION ARE NOT COMMUTATIVE -
because if you change the order of numbers in subtraction and division ,you get a different answer.


- Division of a whole number by 0 is not defined.

FINDING THE PRODUCT SUITABLE GROUPING

Like we did in addition , we will first multiply two numbers whose product should  be a multiple of 10 and then multiply the third number to this. This makes calculations easy.
For eg.  7 x 5 x 2                     
               ( 5 x 2 ) x 7           
               10 x 7 = 70

REMEMBER THESE ...

        5 x 2 = 10   
      25 x 4 = 100
       50 x 2 = 100
      125 x 8 = 1000
     40 x 25  = 1000
     625 x 16 = 10000

NOW SOLVE THESE SUMS IN YOUR NOTEBOOK

1. Find the product using suitable grouping
a. 2 x 6 x 50  
b. 4 x 12 x 125                                     
c. 25 x 23 x 4
d. 125 x 144 x 8      
e. 40 x 235 x 25
f. 16 x 546 x 625

REVISIT THE LAST THREE BLOGS OF- WHOLE NUMBERS.

This is all for today!