Knowing our numbers
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This document discusses several topics related to numbers and numerals including: 1. Place value systems for representing numbers in the Indian and international systems. 2. Rules for comparing two numbers based on their place values. 3. Steps for rounding numbers to the nearest ten, hundred, or thousand. 4. An introduction to the Roman numeral system and some examples of numerals written in Roman and Hindu-Arabic systems.
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9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
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occur natural.
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Knowing our numbers
- 1. 6/23/2017 1
- 2. Knowing our numbers helps us in counting objects in large numbers & representing them through numerals. Numbers helps in communicating through suitable number names & to count concrete objects. They help us to say which collection of bigger & arrange them in order. 6/23/2017 2
- 3. INDIAN Period Ten Lakhs, Lakh ,Ten Thousand , Thousand, Hundred Tens Ones TL L T Th Th H T O For example: 9951024 can be placed in place value chart as TL L T Th Th H T O 9 9 5 1 0 2 4 6/23/2017 3
- 4. International Number : Ten Million , Million , Hundred Thousand, Ten Thousand, Thousand , Hundred, Tens, Ones TM M H TH T Th Th H T O For example: 96743682 can be placed in place value chart as TM M H Th T Th Th H T O 9 6 7 4 3 6 8 2 6/23/2017 4
- 5. In order to compare two numbers, we adopt the following rulers:- RULE 2:- Suppose we have to compare two numbers having the same numbers of digits than we proceed as under Step 1- First compare the digits at the leftmost place in both the numbers Step 2- If they are equal in value then compare the second digits from the left. Step 3- if the second digits from the left are equal then compare the third digits from the left. Step 4- continue until you come across unequal digits at the corresponding places. Clearly, the number with greater such digit is the greater of the two. 6/23/2017 5
- 6. Rounding a number to the nearest ten Step 1- See the ones digit of the given number. Step 2- If ones digit is less than 5, replace ones digit by 0, & keep the other digits as they are. Step 3- If ones digit is 5, increase tens digit by 1, & replace ones digit by 0. EXAMPLE:- In 53, the ones digit is 3<5 so, the required rounded number is 50 6/23/2017 6
- 7. Rounding a number to the nearest hundred Step 1- See the tens digit of the given number. Step 2- If tens digit is less than 5, replace each one of tens & ones digits by 0, & keep the other digits as they are. Step 3- If this digit is 5 or more, increase hundreds digit by 1 & replace each digit on its right by 0. EXAMPLES:- In 648, the tens digit is 4<5So, the required rounded number is 600 6/23/2017 7
- 8. Rounding a number to the nearest thousand Step 1- See the hundreds digit of the given number. Step 2- If hundreds digit is less than 5, replace each one of hundreds, tens & ones digits by 0, & keep the other digits as they are. Step 3- If hundreds digit is 5 or more, increase thousands digit by 1 & replace each digit on its right by 0. EXAMPLE:- In 5486 the hundreds digit is 4<5So, the required rounded number is 5000 6/23/2017 8
- 9. One of the early systems of writing numerals is the system of roman numerals. There are seven basic symbols to write any numeral. These symbols are given below:- ROMAN I V X L C D M NUMERAL HINDU- 1 5 10 50 100 500 1000 ARABIC NUMERAL EXAMPLE:- CXIV= 100+ 10+(5-1)= 114 XL= (50-10)= 40 6/23/2017 9
- 10. 6/23/2017 10 PRESENTED BY TANISH KHURANA VI B ROLL NO. 31