Knowing Our Number class 6th chapter 1 introduction

Knowing Our Number

                       

                           [Introduction] 

(A) Comparing Numbers 

(i) 92,392,4456,89742

89742─i am the greatest

(ii) 1902,1920,9201,9210

9210―i am the greatest

Find the greatest and smallest Numbers

(1)4536,4892,4370,4452

Ans:-greatest:- 4892

           Smallest:-4370

(2) 15632,15073,15189,15800

Ans:- greatest:- 15800

           Smallest:-15073

(3) 382,4972,18,750

Ans:- greatest:- 4972

           Smallest:-18

 (B) Large Numbers             Lower number                      

                  9            +  1=     10                           

one digit number                two digit number

                99             +1=      100                    

two digit number                 three digit number 

                 999          +1=      1,000               

three digit number               four digit Number 

                9,999        +1=      10,000     

four digit Number                five digit Number 

              99,999        +1=     1,00,000  

five digit number                 six digit Number 

           9,99,999       +1 =     1,000,000    

six digit number                  seven digit Number 

         9,999,999        +1=      1,00,00,000

seven digit Number             eight digit Number 

(C)Place values

2,75,395 is

2*1,00,000

7*10,000

5*1,000

3*100

9*10

5*1

2,75,395 =

2*1,00,000

+ 7*10,000

+ 5*1,000

+ 3*100

+ 9*10

+ 5*1

(D)Some Numbers We Use:-

FOR Weight/ Volume and Distance

Gram/Kg/Liter/ml and   Meter/Km/cm/mm

(E)Commas Indian System, International System

As per the Indian currency system:

·        1-Ones

·        10-Tens

·        100-Hundred

·        1000-Thousand

·        10,000-Ten thousand

·        1,00,000-One Lakh

·        10,00,000-Ten

·        1,00,00,000-One

·        10,00,00,000-Ten

As per the international currency system:

• 1-Ones
• 10-Tens
• 100-Hundred
• 1000-Thousand
• 10,000-Ten thousand
• 100,000-Hundred thousand
• 1,000,000-Million
• 10,000,000-Ten Million
• 100,000,000-Hundred million
• 1,000,000,000-Billion
• 10,000,000,000-Ten Billion

(F)Rounding off numbers

  ≥ 5 number is rounded to next bigger numbers…

(G)Some Imp Measurements 

10 millimetres=1 centimetres

1 meters = 100 centimetres

100 centimetre= 1000 millimetres

1 kilometres=1000 metres

1 km=1000 m

1000 m=1000*1000=10,00,000 millimetres

1 gram=1000 milligrams

1 liter= 1000 millilitres 

 THANK YOU for reading