Class 4 Number System
Recap of Number System
In class III, we learnt up to 5 digits numbers.
Smallest 5-digit number is 10000, it is read as ten thousand.
Largest 5-digit number is 99999, it is read as ninety nine thousand nine hundred ninety nine.
One more than 99999 = 99999 + 1 = 100000
100000 read as one lakh. It is the smallest six digit number.
One more than 100000 = 100000 + 1 = 100001
100001 is read as one lakh one.
100010 is read as one lakh ten.
100099 is read as one lakh ninety nine.
100201 is read as one lakh two hundred one.
105001 is read as one lakh five thousand one.
109999 is read as one lakh nine thousand nine hundred ninety nine.
152065 is read as one lakh fifty two thousand sixty five.
999999 is the greatest six digit number.
Place Value of 6-Digit Number
Place value table and some examples
Expanded Forms of Six Digit Numbers
In class III, we learnt how to write 4/5 digit number in expanded form. Here we will learn how to write 6 digit
number in an expanded form.
Example 1. Write 654213 in expanded form.
654213 = 600000 + 50000 + 4000 + 200 + 10 + 3
Example 2. Write 405032 in expanded form.
405032 = 400000 + 0 + 5000 + 0 + 30 + 2
= 400000 + 5000 + 30 + 2
Comparison of Two Numbers
In class III, we have learnt how to compare two numbers. We will follow the same rules for comparing 6 digit numbers.
Rule 1. Number which contains more digits is greater than the number having less digits.
Rule 2. When two numbers contain same digits then we compare left most digits of both the numbers.
Number which is having greater digit should be considered as larger number. If the left most digits of both the numbers are same, then we compare the next digits to the right. This process continues till we get a greater digit to decide which number is greater.
Example 1. Which number is greater? 665785 and 676865
Solution. For both the numbers lakh place is having digit 6. We can not decide which number is greater by comparing lakh place.
Now, letís consider ten thousand place.
665785 has 6 in ten thousand place.
676865 has 7 in ten thousand place.
We know 7 is greater than 6.
So, 665785 is less than 676865.
Ascending order means, writing a given group of numbers in increasing order. Letís have a look at some examples.
Example 1. Arrange the below given numbers in ascending order.
506780, 500789, 506098, 567893
Solution. 500789, 506098, 506780, 567893
Descending order means writing a given group of numbers in decreasing order. Letís have a look at few examples.
Example 1. Arrange the below given numbers in descending order.
156798, 156780, 155634, 165020
Solution. 165020, 156798, 156780, 155634
Indian Number System
International Number System
Number System TestNumber System Test - 1 Number System Test - 2
Class-4 Number System WorksheetNumber System Worksheet - 1 Number System Worksheet - 2 Number System Worksheet - 3 Number System Worksheet - 4
Number-System-AnswerDownload the pdf
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