Place Value of a digit=(face value of the digit) X (value of the place)
The face value of the digit is same as the number. The face value of the digit 5 in the number 56,789 is 5, the face value of the number 8 is 8. It does not matter where the number is placed.
The place value and the face value of the digit 0 in any given number is always whatever is its position in the number.
Do not use ‘and’ anywhere while writing a number name and the name of the period is also not written in plural while writing a number name.
The same digits at different places have different place values.
Number System : Tth Th H T O
Tth = Ten thousand. The place value of the digit 5 is 5 X 10,000 = 50,000
Th = Thousand. The place value of the digit 6 is 6 X 1,000 = 6,000
H = Hundred. The place value of the digit 7 is 7 X 100 = 700
T = Tens. The place value of the digit 8 is 8 X 10 = 80
O = Ones. The place value of the digit 9 is 9 X 1 = 9.
In the number 56,789 The number is Fifty six thousand,seven hundred eighty nine.
The number 3,50,876 can also be written as 3,00,000 + 50,000 + 800 + 76 or three lacs, fifty thousand,eight hundred seventy six.
One Million = 10,00,000 or 10 lacs.
The Roman numerals are as follows –
The symbol V, L and D are never repeated. Other symbols cannot be repeated more than three times. When we have to write suppose 90, it is ( 100 – 10 ) then for 100 is C and for ten we have to put the symbol X, thus it can be written as XC.
Hence the Roman numeral for 900 is CM.
The Roman numeral for 78 is LXXVIII
Basic rules of Roman numerals
In the Roman system there is no symbol for 0
Repetition of a Roman numeral means addition
A smaller numeral written to the right of a larger numeral is always added to the larger numeral.
A smaller numeral written to the left of a larger numeral is always subtracted from the larger numeral.
When a smaller numeral is placed between two larger numerals , then it is always subtracted from the larger numeral immediately following it.