Class 4 Exam > Class 4 Videos > Mathematics for Class 4 > Roman Numerals
Roman Numerals Video Lecture | Mathematics for Class 4
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FAQs on Roman Numerals Video Lecture - Mathematics for Class 4
| 1. How do you convert Roman numerals to Arabic numerals? |  |
Ans. To convert Roman numerals to Arabic numerals, you simply add the values of the Roman numerals from left to right. For example, to convert "XIV" to Arabic numerals, you would add 10 (X) + 1 (I) + 5 (V) to get 14.
| 2. What is the largest Roman numeral that can be represented using the basic symbols? | |
Ans. The largest Roman numeral that can be represented using the basic symbols is 3,999, which is represented as MMMCMXCIX.
| 3. How do you subtract Roman numerals? | |
Ans. To subtract Roman numerals, you simply subtract the value of the smaller numeral from the larger numeral. For example, to subtract "IV" from "IX", you would subtract 1 (I) from 5 (V) to get 4 (IV).
| 4. Are there any rules for writing Roman numerals? | |
Ans. Yes, there are rules for writing Roman numerals. Some key rules include: not repeating a symbol more than three times in a row, placing a smaller numeral before a larger numeral to subtract its value, and writing numerals from left to right in descending order.
| 5. Can Roman numerals be used in modern times? | |
Ans. Yes, Roman numerals are still used in modern times, particularly in book chapters, movie credits, and on clock faces. They are also commonly used in the naming of monarchs and popes.
Text Transcript from Video
0:0:0: hello everyone today we are going to
0:0:2: understand A New Concept of Roman
0:0:5: numerals students do you know how we
0:0:8: write
0:0:8: for yes we write it like this but have
0:0:13: you seen what is written outside your
0:0:15: classroom above your door it is written
0:0:18: as class 4 well this is
0:0:21: interesting we can write four in this
0:0:24: way too so the numbers that we write
0:0:27: normally like 1 2 3 and 4 are called
0:0:31: Hindu Arabic
0:0:32: numbers but we also see another way of
0:0:35: writing these numbers using alphabets
0:0:37: like your class or the time on the clock
0:0:41: they are called the Roman
0:0:43: numerals we use seven alphabets to write
0:0:46: Roman
0:0:47: numbers let us see them one by one I
0:0:52: this alphabet represents one of Roman
0:0:55: numerals it is equal to one we this
0:1:0: represents five in Roman
0:1:2: numerals X this represents 10 in Roman
0:1:6: numerals L represents 50 c represents
0:1:11: 100 D represents
0:1:13: 500 M represents
0:1:16: 1,000 let us look at their values once
0:1:19: again we have I as 1 we as 5 x as 10 L
0:1:27: as 50 c as 100
0:1:31: d as
0:1:32: 500 M as
0:1:35: 1,000 an interesting fact to note in
0:1:38: Roman numbers is that it does not have
0:1:40: any symbol for zero now that we have
0:1:43: seen the values of these
0:1:45: numerals we should learn how to use them
0:1:48: to create bigger
0:1:50: numbers let us start here we have one
0:1:54: but what about this here we have two
0:1:57: ones written together so we will add
0:2:1: them we will get two in the same way we
0:2:5: have 10 XX is 10 + 10 = 20 now let's try
0:2:12: once again here we have five what about
0:2:16: now is it 10 no it is not 10 we use x to
0:2:22: represent 10 so there must be some rules
0:2:26: to write these Roman
0:2:28: numerals let us look at them one by one
0:2:32: we have three rules which help us in
0:2:34: writing Roman
0:2:35: numbers rule one rule of
0:2:38: repetition when a symbol is repeated
0:2:41: twice or Thrice its value also becomes
0:2:43: twice or Thrice
0:2:45: respectively I I is 2 XXX 10 + 10 + 10 =
0:2:51: 30 and CC is 100 + 100 equal
0:2:56: 200 however we must ensure some
0:2:58: conditions
0:3:0: the conditions are symbols i x and C can
0:3:4: be repeated three times at maximum
0:3:7: symbols v l and D cannot be
0:3:10: repeated rule two rule of addition if a
0:3:14: symbol of smaller value is written to
0:3:16: the right of a symbol of higher value we
0:3:18: add smaller value to the greater value
0:3:21: for example x i your I is smaller than x
0:3:26: hence we add them 10 + 1 is equal to 11
0:3:32: XXV means 10 + 10 + 5 is equal
0:3:36: 25 now tell me the value of
0:3:42: LV we get 50 + 5 =
0:3:46: 55 rule three rule of
0:3:49: subtraction if a symbol of smaller value
0:3:52: is to the left of higher value we
0:3:54: subtract the smaller value from the
0:3:56: higher
0:3:57: value however the symbols of V L and D
0:4:0: cannot be subtracted from any number so
0:4:3: we can have IV as four but we can't use
0:4:6: VX as 5 now can you tell how we can
0:4:9: write 9 and
0:4:11: 19 yes N9 will be written as N9 19 will
0:4:16: be written as X
0:4:18: iix hence when writing Roman numbers we
0:4:21: just have to remember these three
0:4:23: rules and we can write any number now
0:4:27: let us try to write the Roman numeral
0:4:29: forms of all numbers up to
0:4:31: 20 we have
0:4:35: 1
0:4:38: 2
0:4:40: 3
0:4:43: 4
0:4:46: 5
0:4:48: 6
0:4:51: 7
0:4:54: 8
0:4:57: 9
0:4:58: 10
0:5:3: 11
0:5:6: 12
0:5:9: 13
0:5:12: 14
0:5:14: 15
0:5:18: 16
0:5:21: 17
0:5:24: 18
0:5:27: 19 20
0:5:35: let us try to read a large Roman numeral
0:5:38: it is written as
0:5:40: XLV let us watch it closely write it
0:5:44: with some space here we know the values
0:5:47: as X is equal to 10 L is equal to 50 V
0:5:51: is equal to 5 using the rule of
0:5:54: subtraction we get XL = 50 - 10 is equal
0:5:59: to 40 now we also have V to the right of
0:6:3: it hence using the rule of
0:6:5: addition we get XEL V is equal to 40 + 5
0:6:10: =
0:6:11: 45 hence X LV represents
0:6:14: 45 very good now let us try to write the
0:6:19: Roman form of
0:6:20: 65 here we know that 50 is equal to l 10
0:6:24: is equal to X and 5 is equal to V so we
0:6:28: get 65 as 50 + 10 + 5 write their
0:6:33: symbols we get 65 equal
0:6:37: lxv so in this way you can read and
0:6:40: write all the Roman
0:6:42: numerals we hope that you have
0:6:44: understood the concept of Roman
0:6:47: numerals now here's a secret on how you
0:6:50: can study effectively with the urv app
0:6:53: you can learn with chapter notes watch
0:6:55: video lectures and solve ncer based MC Q
0:6:59: tests of this chapter on
0:7:1: urv and that's not all you also get
0:7:4: amazing courses for class 4 and much
0:7:7: more for your class 4
0:7:9: preparation thank you
0:0:2: understand A New Concept of Roman
0:0:5: numerals students do you know how we
0:0:8: write
0:0:8: for yes we write it like this but have
0:0:13: you seen what is written outside your
0:0:15: classroom above your door it is written
0:0:18: as class 4 well this is
0:0:21: interesting we can write four in this
0:0:24: way too so the numbers that we write
0:0:27: normally like 1 2 3 and 4 are called
0:0:31: Hindu Arabic
0:0:32: numbers but we also see another way of
0:0:35: writing these numbers using alphabets
0:0:37: like your class or the time on the clock
0:0:41: they are called the Roman
0:0:43: numerals we use seven alphabets to write
0:0:46: Roman
0:0:47: numbers let us see them one by one I
0:0:52: this alphabet represents one of Roman
0:0:55: numerals it is equal to one we this
0:1:0: represents five in Roman
0:1:2: numerals X this represents 10 in Roman
0:1:6: numerals L represents 50 c represents
0:1:11: 100 D represents
0:1:13: 500 M represents
0:1:16: 1,000 let us look at their values once
0:1:19: again we have I as 1 we as 5 x as 10 L
0:1:27: as 50 c as 100
0:1:31: d as
0:1:32: 500 M as
0:1:35: 1,000 an interesting fact to note in
0:1:38: Roman numbers is that it does not have
0:1:40: any symbol for zero now that we have
0:1:43: seen the values of these
0:1:45: numerals we should learn how to use them
0:1:48: to create bigger
0:1:50: numbers let us start here we have one
0:1:54: but what about this here we have two
0:1:57: ones written together so we will add
0:2:1: them we will get two in the same way we
0:2:5: have 10 XX is 10 + 10 = 20 now let's try
0:2:12: once again here we have five what about
0:2:16: now is it 10 no it is not 10 we use x to
0:2:22: represent 10 so there must be some rules
0:2:26: to write these Roman
0:2:28: numerals let us look at them one by one
0:2:32: we have three rules which help us in
0:2:34: writing Roman
0:2:35: numbers rule one rule of
0:2:38: repetition when a symbol is repeated
0:2:41: twice or Thrice its value also becomes
0:2:43: twice or Thrice
0:2:45: respectively I I is 2 XXX 10 + 10 + 10 =
0:2:51: 30 and CC is 100 + 100 equal
0:2:56: 200 however we must ensure some
0:2:58: conditions
0:3:0: the conditions are symbols i x and C can
0:3:4: be repeated three times at maximum
0:3:7: symbols v l and D cannot be
0:3:10: repeated rule two rule of addition if a
0:3:14: symbol of smaller value is written to
0:3:16: the right of a symbol of higher value we
0:3:18: add smaller value to the greater value
0:3:21: for example x i your I is smaller than x
0:3:26: hence we add them 10 + 1 is equal to 11
0:3:32: XXV means 10 + 10 + 5 is equal
0:3:36: 25 now tell me the value of
0:3:42: LV we get 50 + 5 =
0:3:46: 55 rule three rule of
0:3:49: subtraction if a symbol of smaller value
0:3:52: is to the left of higher value we
0:3:54: subtract the smaller value from the
0:3:56: higher
0:3:57: value however the symbols of V L and D
0:4:0: cannot be subtracted from any number so
0:4:3: we can have IV as four but we can't use
0:4:6: VX as 5 now can you tell how we can
0:4:9: write 9 and
0:4:11: 19 yes N9 will be written as N9 19 will
0:4:16: be written as X
0:4:18: iix hence when writing Roman numbers we
0:4:21: just have to remember these three
0:4:23: rules and we can write any number now
0:4:27: let us try to write the Roman numeral
0:4:29: forms of all numbers up to
0:4:31: 20 we have
0:4:35: 1
0:4:38: 2
0:4:40: 3
0:4:43: 4
0:4:46: 5
0:4:48: 6
0:4:51: 7
0:4:54: 8
0:4:57: 9
0:4:58: 10
0:5:3: 11
0:5:6: 12
0:5:9: 13
0:5:12: 14
0:5:14: 15
0:5:18: 16
0:5:21: 17
0:5:24: 18
0:5:27: 19 20
0:5:35: let us try to read a large Roman numeral
0:5:38: it is written as
0:5:40: XLV let us watch it closely write it
0:5:44: with some space here we know the values
0:5:47: as X is equal to 10 L is equal to 50 V
0:5:51: is equal to 5 using the rule of
0:5:54: subtraction we get XL = 50 - 10 is equal
0:5:59: to 40 now we also have V to the right of
0:6:3: it hence using the rule of
0:6:5: addition we get XEL V is equal to 40 + 5
0:6:10: =
0:6:11: 45 hence X LV represents
0:6:14: 45 very good now let us try to write the
0:6:19: Roman form of
0:6:20: 65 here we know that 50 is equal to l 10
0:6:24: is equal to X and 5 is equal to V so we
0:6:28: get 65 as 50 + 10 + 5 write their
0:6:33: symbols we get 65 equal
0:6:37: lxv so in this way you can read and
0:6:40: write all the Roman
0:6:42: numerals we hope that you have
0:6:44: understood the concept of Roman
0:6:47: numerals now here's a secret on how you
0:6:50: can study effectively with the urv app
0:6:53: you can learn with chapter notes watch
0:6:55: video lectures and solve ncer based MC Q
0:6:59: tests of this chapter on
0:7:1: urv and that's not all you also get
0:7:4: amazing courses for class 4 and much
0:7:7: more for your class 4
0:7:9: preparation thank you
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Dec 22, 2024 Last updated |
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