неділю, 3 травня 2020 р.

Pace Work 7-D 04/05

Тема: Вивчення Римських цифр.

Presentation of new material
     T.: Ancient Romans used a special method of showing numbers
Examples: They wrote III instead of 3
 And wrote IX instead of 9
The Roman Symbols
Romans Numerals are based on the following symbols:
1 5 10 50 100 500 1000
I V X L C D M
Basic Combinations
Which can be combined like this:
1 2 3 4 5 6 7 8 9
I II III IV V VI VII VIII IX

10 20 30 40 50 60 70 80 90
X XX XXX XL L LX LXX LXXX XC
 
100 200 300 400 500 600 700 800 900
C CC CCC CD D DC DCC DCCC CM
Forming Numbers - The Rules
When a symbol appears after a larger symbol it is added. Example: VI = V + I = 5 + 1 = 6
But if the symbol appears before a larger symbol it is subtracted. Example: IX = X - I = 10 - 1 = 9
Remember: After Larger is Added
Really Big Numbers
Numbers greater than 1,000 are formed by placing a dash over the symbol, meaning "times 1,000", but these are not commonly used:
5,000 10,000 50,000 100,000 500,000 1,000,000
V    X      L     C        D          M

How to Convert to Roman Numerals
Break the number into Thousands, Hundreds, Tens and Units and write down each in turn.
Example: Convert 1984 to Roman Numerals.

Break 1984 into 1000, 900, 80 and 4, then do each conversion1000 = M
900 = CM
80 = LXXX
4 = IV
So 1984 = MCMLXXXIV
How To Remember
Think "MeDiCaL XaVIer". 
 It has the roman numerals in order from 1000 to 1.
     T.: Now, let’s solve some problems.
Task 1: Convert 1754, 4736, 1425, 1998, 2014, 2015, 1994 to Roman Numerals.
Task 2: Convert MMIV, MMMCLXVII, MMDCCLXXIV, MCLXXVIII, DCCLXXXIV
 to ordinary numerals.
     T.: Answer my questions:
What is 31 in Roman numerals?
What is 45 in Roman numerals?
What is 73 in Roman numerals?
What is 25 in Roman numerals?
What is 95 in Roman numerals?
What is 75 in Roman numerals?
What is 74 in Roman numerals?
What is 83 in Roman numerals?
What is 92 in Roman numerals?

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